PATENTS
LIST OF UNITED STATES PATENTS
List of United States patents granted to Thomas A. Edison, arranged according to dates of execution of applications for such patents. This list shows the inventions as Mr. Edison has worked upon them from year to year
1868
NO. TITLE OF PATENT DATE EXECUTED DATE EXECUTED
90,646, Electrographic Vote Recorder . . . . .Oct. 13, 1868
1869
91,527 Printing Telegraph (reissued October
25, 1870, numbered 4166, and August
5, 1873, numbered 5519). . . . . . . .Jan. 25, 1869
96,567 Apparatus for Printing Telegraph (reissued
February 1, 1870, numbered
3820). . . . . . . . . . . . . . . . .Aug. 17, 1869
96,681 Electrical Switch for Telegraph ApparatusAug. 27, 1869
102,320 Printing Telegraph--Pope and Edison
(reissued April 17, 1877, numbered
7621, and December 9, 1884, numbered
10,542). . . . . . . . . . . . . . . Sept. 16, 1869
103,924 Printing Telegraphs--Pope and Edison
(reissued August 5, 1873) 1870
103,035 Electromotor Escapement. . . . . . . . Feb. 5, 1870
128,608 Printing Telegraph Instruments . . . . .May 4, 1870
114,656 Telegraph Transmitting Instruments . .June 22, 1870
114,658 Electro Magnets for Telegraph
Instruments. . . . . . . . . . . . . .June 22, 1870
114,657 Relay Magnets for Telegraph
Instruments. . . . . . . . . . . . . .Sept. 6, 1870
111,112 Electric Motor Governors . . . . . . .June 29, 1870
113,033 Printing Telegraph Apparatus . . . . .Nov. 17, 1870
1871
113,034 Printing Telegraph Apparatus . . . . .Jan. 10, 1871
123,005 Telegraph Apparatus. . . . . . . . . .July 26, 1871
123,006 Printing Telegraph . . . . . . . . . .July 26, 1871
123,984 Telegraph Apparatus. . . . . . . . . .July 26, 1871
124,800 Telegraphic Recording Instruments. . .Aug. 12, 1871
121,601 Machinery for Perforating Paper for
Telegraph Purposes . . . . . . . . . .Aug. 16, 1871
126,535 Printing Telegraphs. . . . . . . . . .Nov. 13, 1871
133,841 Typewriting Machine. . . . . . . . . .Nov. 13, 1871
1872
126,532 Printing Telegraphs. . . . . . . . . . .Jan. 3 1872 126,531 Printing Telegraphs. . . . . . . . . .Jan. 17, 1872
126,534 Printing Telegraphs. . . . . . . . . .Jan. 17, 1872
126,528 Type Wheels for Printing Telegraphs. .Jan. 23, 1872
126,529 Type Wheels for Printing Telegraphs. .Jan. 23, 1872
126,530 Printing Telegraphs. . . . . . . . . .Feb. 14, 1872
126,533 Printing Telegraphs. . . . . . . . . .Feb. 14, 1872
132,456 Apparatus for Perforating Paper for
Telegraphic Use. . . . . . . . . . . March 15, 1872
132,455 Improvement in Paper for Chemical
Telegraphs . . . . . . . . . . . . . April 10, 1872
133,019 Electrical Printing Machine. . . . . April 18, 1872
128,131 Printing Telegraphs. . . . . . . . . April 26, 1872
128,604 Printing Telegraphs. . . . . . . . . April 26, 1872
128,605 Printing Telegraphs. . . . . . . . . April 26, 1872
128,606 Printing Telegraphs. . . . . . . . . April 26, 1872
128,607 Printing Telegraphs. . . . . . . . . April 26, 1872
131,334 Rheotomes or Circuit Directors . . . . .May 6, 1872
134,867 Automatic Telegraph Instruments. . . . .May 8, 1872
134,868 Electro Magnetic Adjusters . . . . . . .May 8, 1872
130,795 Electro Magnets. . . . . . . . . . . . .May 9, 1872
131,342 Printing Telegraphs. . . . . . . . . . .May 9, 1872
131,341 Printing Telegraphs. . . . . . . . . . May 28, 1872
131,337 Printing Telegraphs. . . . . . . . . .June 10, 1872
131,340 Printing Telegraphs. . . . . . . . . .June 10, 1872
131,343 Transmitters and Circuits for Printing
Telegraph. . . . . . . . . . . . . . .June 10, 1872 131,335 Printing Telegraphs. . . . . . . . . .June 15, 1872
131,336 Printing Telegraphs. . . . . . . . . .June 15, 1872
131,338 Printing Telegraphs. . . . . . . . . .June 29, 1872
131,339 Printing Telegraphs. . . . . . . . . .June 29, 1872
131,344 Unison Stops for Printing Telegraphs .June 29, 1872
134,866 Printing and Telegraph Instruments . .Oct. 16, 1872
138,869 Printing Telegraphs. . . . . . . . . .Oct. 16, 1872
142,999 Galvanic Batteries . . . . . . . . . .Oct. 31, 1872
141,772 Automatic or Chemical Telegraphs . . . Nov. 5, 1872
135,531 Circuits for Chemical Telegraphs . . . Nov. 9, 1872
146,812 Telegraph Signal Boxes . . . . . . . .Nov. 26, 1872
141,773 Circuits for Automatic Telegraphs. . .Dec. 12, 1872
141,776 Circuits for Automatic Telegraphs. . .Dec. 12, 1872
150,848 Chemical or Automatic Telegraphs . . .Dec. 12, 1872
1873
139,128 Printing Telegraphs. . . . . . . . . .Jan. 21, 1873
139,129 Printing Telegraphs. . . . . . . . . .Feb. 13, 1873
140,487 Printing Telegraphs. . . . . . . . . .Feb. 13, 1873
140,489 Printing Telegraphs. . . . . . . . . .Feb. 13, 1873
138,870 Printing Telegraphs. . . . . . . . . .March 7, 1873
141,774 Chemical Telegraphs. . . . . . . . . .March 7, 1873
141,775 Perforator for Automatic Telegraphs. .March 7, 1873
141,777 Relay Magnets. . . . . . . . . . . . .March 7, 1873
142,688 Electric Regulators for Transmitting
Instruments . . . . . . . . . . . . . .March 7, 1873 156,843 Duplex Chemical Telegraphs . . . . . .March 7, 1873
147,312 Perforators for Automatic Telegraphy March 24, 1873
147,314 Circuits for Chemical Telegraphs . . March 24, 1873
150,847 Receiving Instruments for Chemical
Telegraphs . . . . . . . . . . . . . March 24, 1873
140,488 Printing Telegraphs. . . . . . . . . April 23, 1873
147,311 Electric Telegraphs. . . . . . . . . April 23, 1873
147,313 Chemical Telegraphs. . . . . . . . . April 23, 1873
147,917 Duplex Telegraphs. . . . . . . . . . April 23, 1873
150,846 Telegraph Relays . . . . . . . . . . April 23, 1873
160,405 Adjustable Electro Magnets for
Relays, etc. . . . . . . . . . . . . April 23, 1873
162,633 Duplex Telegraphs. . . . . . . . . . April 22, 1873
151,209 Automatic Telegraphy and Perforators
Therefor . . . . . . . . . . . . . . .Aug. 25, 1873
160,402 Solutions for Chemical Telegraph PaperSept. 29, 1873
160,404 Solutions for Chemical Telegraph PaperSept. 29, 1873
160,580 Solutions for Chemical Telegraph PaperOct. 14, 1873
160,403 Solutions for Chemical Telegraph PaperOct. 29, 1873
1874
154,788 District Telegraph Signal Box. . . . .April 2, 1874
168,004 Printing Telegraph . . . . . . . . . . May 22, 1874
166,859 Chemical Telegraphy. . . . . . . . . . June 1, 1874
166,860 Chemical Telegraphy. . . . . . . . . . June 1, 1874 166,861 Chemical Telegraphy. . . . . . . . . . June 1, 1874
158,787 Telegraph Apparatus. . . . . . . . . . Aug. 7, 1874
172,305 Automatic Roman Character
Telegraph. . . . . . . . . . . . . . . Aug. 7, 1874
173,718 Automatic Telegraphy . . . . . . . . . Aug. 7, 1874
178,221 Duplex Telegraphs. . . . . . . . Aug. 19, 1874
178,222 Duplex Telegraphs. . . . . . . . . . .Aug. 19, 1874
178,223 Duplex Telegraphs. . . . . . . . . . .Aug. 19, 1874
180,858 Duplex Telegraphs. . . . . . . . . . .Aug. 19, 1874
207,723 Duplex Telegraphs. . . . . . . . . . .Aug. 19, 1874
480,567 Duplex Telegraphs. . . . . . . . . . .Aug. 19, 1874
207,724 Duplex Telegraphs. . . . . . . . . . .Dec. 14, 1874
1875
168,242 Transmitter and Receiver for Automatic
Telegraph. . . . . . . . . . . . . . .Jan. 18, 1875
168,243 Automatic Telegraphs . . . . . . . . .Jan. 18, 1875
168,385 Duplex Telegraphs. . . . . . . . . . .Jan. 18, 1875
168,466 Solution for Chemical Telegraphs . . .Jan. 18, 1875
168,467 Recording Point for Chemical TelegraphJan. 18, 1875
195,751 Automatic Telegraphs . . . . . . . . . Jan. 18 1875
195,752 Automatic Telegraphs . . . . . . . . .Jan. 19, 1875
171,273 Telegraph Apparatus. . . . . . . . . . Feb 11, 1875
169,972 Electric Signalling Instrument . . . . Feb 24, 1875
209,241 Quadruplex Telegraph Repeaters (reissued September 23, 1879, numbered
8906). . . . . . . . . . . . . . . . . Feb 24, 1875
1876
180,857 Autographic Printing . . . . . . . . .March 7, 1876
198,088 Telephonic Telegraphs. . . . . . . . .April 3, 1876
198,089 Telephonic or Electro Harmonic
Telegraphs . . . . . . . . . . . . . .April 3, 1876
182,996 Acoustic Telegraphs. . . . . . . . . . .May 9, 1876
186,330 Acoustic Electric Telegraphs . . . . . .May 9, 1876
186,548 Telegraph Alarm and Signal Apparatus . .May 9, 1876
198,087 Telephonic Telegraphs. . . . . . . . . .May 9, 1876
185,507 Electro Harmonic Multiplex Telegraph .Aug. 16, 1876
200,993 Acoustic Telegraph . . . . . . . . . .Aug. 26, 1876
235,142 Acoustic Telegraph . . . . . . . . . .Aug. 26, 1876
200,032 Synchronous Movements for Electric
Telegraphs . . . . . . . . . . . . . .Oct. 30, 1876
200,994 Automatic Telegraph Perforator and
Transmitter. . . . . . . . . . . . . .Oct. 30, 1876
1877
205,370 Pneumatic Stencil Pens . . . . . . . . Feb. 3, 1877
213,554 Automatic Telegraphs . . . . . . . . . Feb. 3, 1877
196,747 Stencil Pens . . . . . . . . . . . . April 18, 1877
203,329 Perforating Pens . . . . . . . . . . April 18, 1877 474,230 Speaking Telegraph . . . . . . . . . April 18, 1877
217,781 Sextuplex Telegraph. . . . . . . . . . .May 8, 1877
230,621 Addressing Machine . . . . . . . . . . .May 8, 1877
377,374 Telegraphy . . . . . . . . . . . . . . .May 8, 1877
453,601 Sextuplex Telegraph. . . . . . . . . . May 31, 1877
452,913 Sextuplex Telegraph. . . . . . . . . . May 31, 1877
512,872 Sextuplex Telegraph. . . . . . . . . . May 31, 1877
474,231 Speaking Telegraph . . . . . . . . . . July 9, 1877
203,014 Speaking Telegraph . . . . . . . . . .July 16, 1877
208,299 Speaking Telegraph . . . . . . . . . .July 16, 1877
203,015 Speaking Telegraph . . . . . . . . . .Aug. 16, 1877
420,594 Quadruplex Telegraph . . . . . . . . .Aug. 16, 1877
492,789 Speaking Telegraph . . . . . . . . . .Aug. 31, 1877
203,013 Speaking Telegraph . . . . . . . . . . Dec. 8, 1877
203 018 Telephone or Speaking Telegraph. . . . Dec. 8, 1877
200 521 Phonograph or Speaking Machine . . . .Dec. 15, 1877
1878
203,019 Circuit for Acoustic or Telephonic
Telegraphs . . . . . . . . . . . . . .Feb. 13, 1878
201,760 Speaking Machines. . . . . . . . . . .Feb. 28, 1878
203,016 Speaking Machines. . . . . . . . . . .Feb. 28, 1878
203,017 Telephone Call Signals . . . . . . . .Feb. 28, 1878
214,636 Electric Lights. . . . . . . . . . . . Oct. 5, 1878
222,390 Carbon Telephones. . . . . . . . . . . Nov. 8, 1878 217,782 Duplex Telegraphs. . . . . . . . . . .Nov. 11, 1878
214,637 Thermal Regulator for Electric Lights.Nov. 14, 1878
210,767 Vocal Engines. . . . . . . . . . . . .Aug. 31, 1878
218,166 Magneto Electric Machines. . . . . . . Dec. 3, 1878
218,866 Electric Lighting Apparatus. . . . . . Dec. 3, 1878
219,628 Electric Lights. . . . . . . . . . . . Dec. 3, 1878
295,990 Typewriter . . . . . . . . . . . . . . Dec. 4, 1878
218,167 Electric Lights. . . . . . . . . . . .Dec. 31, 1878
1879
224,329 Electric Lighting Apparatus. . . . . .Jan. 23, 1879
227,229 Electric Lights. . . . . . . . . . . .Jan. 28, 1879
227,227 Electric Lights. . . . . . . . . . . . Feb. 6, 1879
224.665 Autographic Stencils for Printing. . March 10, 1879
227.679 Phonograph . . . . . . . . . . . . . March 19, 1879
221,957 Telephone. . . . . . . . . . . . . . March 24, 1879
227,229 Electric Lights. . . . . . . . . . . April 12, 1879
264,643 Magneto Electric Machines. . . . . . April 21, 1879
219,393 Dynamo Electric Machines . . . . . . . July 7, 1879
231,704 Electro Chemical Receiving Telephone .July 17, 1879
266,022 Telephone. . . . . . . . . . . . . . . Aug. 1, 1879
252,442 Telephone. . . . . . . . . . . . . . . Aug. 4, 1879
222,881 Magneto Electric Machines. . . . . . .Sept. 4, 1879
223,898 Electric Lamp. . . . . . . . . . . . . Nov. 1, 1879 1880
230,255 Electric Lamps . . . . . . . . . . . .Jan. 28, 1880
248,425 Apparatus for Producing High Vacuums Jan.28 1880
265,311 Electric Lamp and Holder for Same. . . Jan. 28 1880
369,280 System of Electrical Distribution. . .Jan. 28, 1880
227,226 Safety Conductor for Electric Lights .March 10,1880
228,617 Brake for Electro Magnetic Motors. . March 10, 1880
251,545 Electric Meter . . . . . . . . . . . March 10, 1880
525,888 Manufacture of Carbons for Electric
Lamps. . . . . . . . . . . . . . . . March 10, 1880
264,649 Dynamo or Magneto Electric Machines. March 11,
1880
228,329 Magnetic Ore Separator . . . . . . . .April 3, 1880
238,868 Manufacture of Carbons for Incandescent
Electric Lamps . . . . . . . . . . . April 25, 1880
237,732 Electric Light . . . . . . . . . . . .June 15, 1880
248,417 Manufacturing Carbons for Electric
Lights . . . . . . . . . . . . . . . .June 15, 1880
298,679 Treating Carbons for Electric Lights .June 15, 1880
248,430 Electro Magnetic Brake . . . . . . . . July 2, 1880
265,778 Electro Magnetic Railway Engine. . . . July 3, 1880
248,432 Magnetic Separator . . . . . . . . . .July 26, 1880
239,150 Electric Lamp. . . . . . . . . . . . .July 27, 1880
239,372 Testing Electric Light Carbons--Edison
and Batchelor. . . . . . . . . . . . .July 28, 1880 251,540 Carbon Electric Lamps. . . . . . . . .July 28, 1880
263,139 Manufacture of Carbons for Electric
Lamps. . . . . . . . . . . . . . . . .July 28, 1880
434,585 Telegraph Relay. . . . . . . . . . . .July 29, 1880
248 423 Carbonizer . . . . . . . . . . . . . .July 30, 1880
263 140 Dynamo Electric Machines . . . . . . .July 30, 1880
248,434 Governor for Electric Engines. . . . .July 31, 1880
239,147 System of Electric Lighting. . . . . .July 31, 1880
264,642 Electric Distribution and Translation
System . . . . . . . . . . . . . . . . Aug. 4, 1880
293,433 Insulation of Railroad Tracks used for
Electric Circuits. . . . . . . . . . . Aug. 6, 1880
239,373 Electric Lamp. . . . . . . . . . . . . Aug. 7, 1880
239,745 Electric Lamp. . . . . . . . . . . . . Aug. 7, 1880
263,135 Electric Lamp. . . . . . . . . . . . . Aug. 7, 1880
251,546 Electric Lamp. . . . . . . . . . . . .Aug. 10, 1880
239,153 Electric Lamp. . . . . . . . . . . . .Aug. 11, 1880
351,855 Electric Lamp. . . . . . . . . . . . .Aug. 11, 1880
248,435 Utilizing Electricity as Motive Power.Aug. 12, 1880
263,132 Electro Magnetic Roller. . . . . . . .Aug. 14, 1880
264,645 System of Conductors for the Distribution
of Electricity . . . . . . . . . . . .Sept. 1, 1880
240,678 Webermeter . . . . . . . . . . . . . Sept. 22, 1880
239,152 System of Electric Lighting. . . . . .Oct. 14, 1880
239,148 Treating Carbons for Electric Lights .Oct. 15, 1880
238,098 Magneto Signalling Apparatus--Edison and Johnson. . . . . . . . . . . . . .Oct. 21, 1880
242,900 Manufacturing Carbons for Electric
Lamps. . . . . . . . . . . . . . . . .Oct. 21, 1880
251,556 Regulator for Magneto or Dynamo
Electric Machines. . . . . . . . . . .Oct. 21, 1880
248,426 Apparatus for Treating Carbons for
Electric Lamps . . . . . . . . . . . . Nov. 5, 1880
239,151 Forming Enlarged Ends on Carbon
Filaments. . . . . . . . . . . . . . .Nov. 19, 1880
12,631 Design Patent--Incandescent Electric
Lamp . . . . . . . . . . . . . . . . .Nov. 23, 1880
239,149 Incandescing Electric Lamp . . . . . . Dec. 3, 1880
242,896 Incandescent Electric Lamp . . . . . . Dec. 3, 1880
242,897 Incandescent Electric Lamp . . . . . . Dec. 3, 1880
248,565 Webermeter . . . . . . . . . . . . . . Dec. 3, 1880
263,878 Electric Lamp. . . . . . . . . . . . . Dec. 3, 1880
239,154 Relay for Telegraphs . . . . . . . . .Dec. 11, 1880
242,898 Dynamo Electric Machine. . . . . . . .Dec. 11, 1880
248,431 Preserving Fruit . . . . . . . . . . .Dec. 11, 1880
265,777 Treating Carbons for Electric Lamps. .Dec. 11, 1880
239,374 Regulating the Generation of Electric
Currents . . . . . . . . . . . . . . .Dec. 16, 1880
248,428 Manufacture of Incandescent Electric
Lamps. . . . . . . . . . . . . . . . .Dec. 16, 1880
248,427 Apparatus for Treating Carbons for
Electric Lamps . . . . . . . . . . . .Dec. 21, 1880 248,437 Apparatus for Treating Carbons for
Electric Lamps . . . . . . . . . . . .Dec. 21, 1880
248,416 Manufacture of Carbons for Electric
Lights . . . . . . . . . . . . . . . .Dec. 30, 1880
1881
242,899 Electric Lighting. . . . . . . . . . .Jan. 19, 1881
248,418 Electric Lamp. . . . . . . . . . . . . Jan. 19 1881
248,433 Vacuum Apparatus . . . . . . . . . . . Jan. 19 1881
251,548 Incandescent Electric Lamps. . . . . .Jan. 19, 1881
406,824 Electric Meter . . . . . . . . . . . .Jan. 19, 1881
248,422 System of Electric Lighting. . . . . .Jan. 20, 1881
431,018 Dynamo or Magneto Electric Machine . . Feb. 3, 1881
242,901 Electric Motor . . . . . . . . . . . .Feb. 24, 1881
248,429 Electric Motor . . . . . . . . . . . .Feb. 24, 1881
248,421 Current Regulator for Dynamo Electric
Machine. . . . . . . . . . . . . . . .Feb. 25, 1881
251,550 Magneto or Dynamo Electric Machines. .Feb. 26, 1881
251,555 Regulator for Dynamo Electric
Machines . . . . . . . . . . . . . . .Feb. 26, 1881
482,549 Means for Controlling Electric
Generation . . . . . . . . . . . . . .March 2, 1881
248,420 Fixture and Attachment for Electric
Lamps. . . . . . . . . . . . . . . . .March 7, 1881
251,553 Electric Chandeliers . . . . . . . . .March 7, 1881 251,554 Electric Lamp and Socket or Holder . .March 7, 1881
248,424 Fitting and Fixtures for Electric
Lamps. . . . . . . . . . . . . . . . .March 8, 1881
248,419 Electric Lamp. . . . . . . . . . . . March 30, 1881
251,542 System of Electric Light . . . . . . April 19, 1881
263,145 Making Incandescents . . . . . . . . April 19, 1881
266,447 Electric Incandescent Lamp . . . . . April 21, 1881
251,552 Underground Conductors . . . . . . . April 22, 1881
476,531 Electric Lighting System . . . . . . April 22, 1881
248,436 Depositing Cell for Plating the Connections
of Electric Lamps. . . . . . . . . . . May 17, 1881
251,539 Electric Lamp. . . . . . . . . . . . . May 17, 1881
263,136 Regulator for Dynamo or Magneto
Electric Machine . . . . . . . . . . . May 17, 1881
251,557 Webermeter . . . . . . . . . . . . . . May 19, 1881
263,134 Regulator for Magneto Electric
Machine. . . . . . . . . . . . . . . . May 19, 1881
251,541 Electro Magnetic Motor . . . . . . . . May 20, 1881
251,544 Manufacture of Electric Lamps. . . . . May 20, 1881
251,549 Electric Lamp and the Manufacture
thereof. . . . . . . . . . . . . . . . May 20, 1881
251,558 Webermeter . . . . . . . . . . . . . . May 20, 1881
341,644 Incandescent Electric Lamp . . . . . . May 20, 1881
251,551 System of Electric Lighting. . . . . . May 21, 1881
263,137 Electric Chandelier. . . . . . . . . . May 21, 1881
263,141 Straightening Carbons for Incandescent Lamps. . . . . . . . . . . . . . . . . May 21, 1881
264,657 Incandescent Electric Lamps. . . . . . May 21, 1881
251,543 Electric Lamp. . . . . . . . . . . . . May 24, 1881
251,538 Electric Light . . . . . . . . . . . . May 27, 1881
425,760 Measurement of Electricity in Distribution
System . . . . . . . . . . . . . . . .May 3 1, 1881
251,547 Electrical Governor. . . . . . . . . . June 2, 1881
263,150 Magneto or Dynamo Electric Machines. June 3, 1881
263,131 Magnetic Ore Separator . . . . . . . . June 4, 1881
435,687 Means for Charging and Using Secondary
Batteries. . . . . . . . . . . . . . .June 21, 1881
263,143 Magneto or Dynamo Electric Machines. .June 24, 1881
251,537 Dynamo Electric Machine. . . . . . . .June 25, 1881
263,147 Vacuum Apparatus . . . . . . . . . . .July 1, 188 1
439,389 Electric Lighting System . . . . . . . July 1, 1881
263,149 Commutator for Dynamo or Magneto
Electric Machines. . . . . . . . . . .July 22, 1881
479,184 Facsimile Telegraph--Edison and Kenny.July 26, 1881
400,317 Ore Separator. . . . . . . . . . . . .Aug. 11, 1881
425,763 Commutator for Dynamo Electric
Machines . . . . . . . . . . . . . . .Aug. 20, 1881
263,133 Dynamo or Magneto Electric Machine . .Aug. 24, 1881
263,142 Electrical Distribution System . . . .Aug. 24, 1881
264,647 Dynamo or Magneto Electric Machines. .Aug. 24, 1881
404,902 Electrical Distribution System . . . .Aug. 24, 1881
257,677 Telephone. . . . . . . . . . . . . . .Sept. 7, 1881 266,021 Telephone. . . . . . . . . . . . . . .Sept. 7, 1881
263,144 Mold for Carbonizing Incandescents . Sept. 19, 1881
265,774 Maintaining Temperatures in
Webermeters. . . . . . . . . . . . . Sept. 21, 1881
264,648 Dynamo or Magneto Electric Machines. Sept. 23, 1881
265,776 Electric Lighting System . . . . . . Sept. 27, 1881
524,136 Regulator for Dynamo Electrical
Machines . . . . . . . . . . . . . . Sept. 27, 1881
273,715 Malleableizing Iron. . . . . . . . . . Oct. 4, 1881
281,352 Webermeter . . . . . . . . . . . . . . Oct. 5, 1881
446,667 Locomotives for Electric Railways. . .Oct. 11, 1881
288,318 Regulator for Dynamo or Magneto
Electric Machines. . . . . . . . . . .Oct. 17, 1881
263,148 Dynamo or Magneto Electric Machines. Oct. 25, 1881
264,646 Dynamo or Magneto Electric Machines. Oct. 25, 1881
251,559 Electrical Drop Light. . . . . . . . .Oct. 25, 1881
266,793 Electric Distribution System . . . . .Oct. 25, 1881
358,599 Incandescent Electric Lamp . . . . . .Oct. 29, 1881
264,673 Regulator for Dynamo Electric Machine. Nov. 3, 1881
263,138 Electric Arc Light . . . . . . . . . . Nov. 7, 1881
265,775 Electric Arc Light . . . . . . . . . . .Nov. 7 1881
297,580 Electric Arc Light . . . . . . . . . . .Nov. 7 1881
263,146 Dynamo Magneto Electric Machines . . .Nov. 22, 1881
266,588 Vacuum Apparatus . . . . . . . . . . .Nov. 25, 1881
251,536 Vacuum Pump. . . . . . . . . . . . . . Dec. 5, 1881
264,650 Manufacturing Incandescent Electric Lamps. . . . . . . . . . . . . . . . . Dec. 5, 1881
264,660 Regulator for Dynamo Electric
Machines . . . . . . . . . . . . . . . Dec. 5, 1881
379,770 Incandescent Electric Lamp . . . . . . Dec. 5, 1881
293,434 Incandescent Electric Lamp . . . . . . Dec. 5, 1881
439,391 Junction Box for Electric Wires. . . . Dec. 5, 1881
454,558 Incandescent Electric Lamp . . . . . . Dec. 5, 1881
264,653 Incandescent Electric Lamp . . . . . .Dec. 13, 1881
358,600 Incandescing Electric Lamp . . . . . .Dec. 13, 1881
264,652 Incandescent Electric Lamp . . . . . .Dec. 15, 1881
278,419 Dynamo Electric Machines . . . . . . .Dec. 15, 1881
1882
265,779 Regulator for Dynamo Electric
Machines . . . . . . . . . . . . . . .Jan. 17, 1882
264,654 Incandescent Electric Lamps. . . . . .Feb. 10, 1882
264,661 Regulator for Dynamo Electric Machines Feb. 10, 1882
264,664 Regulator for Dynamo Electric Machines Feb. 10, 1882
264,668 Regulator for Dynamo Electric Machines Feb. 10, 1882
264,669 Regulator for Dynamo Electric
Machines . . . . . . . . . . . . . . .Feb. 10, 1882
264,671 Regulator for Dynamo Electric
Machines . . . . . . . . . . . . . . .Feb. 10, 1882
275,613 Incandescing Electric Lamp . . . . . .Feb. 10, 1882
401,646 Incandescing Electric Lamp . . . . . .Feb. 10, 1882 264,658 Regulator for Dynamo Electric
Machines . . . . . . . . . . . . . . .Feb. 28, 1882
264,659 Regulator for Dynamo Electric
Machines . . . . . . . . . . . . . . .Feb. 28, 1882
265,780 Regulator for Dynamo Electric
Machines . . . . . . . . . . . . . . .Feb. 28, 1882
265,781 Regulator for Dynamo Electric
Machines . . . . . . . . . . . . . . .Feb. 28, 1882
278,416 Manufacture of Incandescent Electric
Lamps. . . . . . . . . . . . . . . . .Feb. 28, 1882
379,771 Regulator for Dynamo Electric
Machines . . . . . . . . . . . . . . .Feb. 28, 1882
272,034 Telephone. . . . . . . . . . . . . . March 30, 1882
