| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 12 | |
| #2 | Canada | 2 | |
| #3 | Germany | 2 | |
| #4 | France | 2 | |
| #5 | Austria | 1 | |
| #6 | Switzerland | 1 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology | |
| #2 | Optics | |
| #3 | Electrical machinery and energy | |
| #4 | Foods and drinks | |
| #5 | Environmental technology | |
| #6 | Textiles and paper |
| # | Technology | |
|---|---|---|
| #1 | Loudspeakers and microphones | |
| #2 | Special information storage | |
| #3 | Cameras | |
| #4 | Sewing | |
| #5 | Photomechanical semiconductor production | |
| #6 | Batteries | |
| #7 | Reduction of greenhouse gas emissions | |
| #8 | Food shaping |
| # | Name | Total Patents |
|---|---|---|
| #1 | Hopkins Marcus C | 3 |
| #2 | Farrand Clair L | 3 |
| #3 | Rodman Isaac P | 2 |
| #4 | Houghton Vernon T | 2 |
| #5 | Lektophone Corporation | 1 |
| #6 | Scott Hutchinson William | 1 |
| #7 | Harrison Thornton C | 1 |
| #8 | Davis William H | 1 |
| #9 | Joss Fredrick E | 1 |
| #10 | Plews William J | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1975941A | Bag closing machine | |
| US1983402A | Production of motion pictures in natural colors | |
| US2011544A | Color photography | |
| US1829355A | Acoustic diaphragm | |
| US1990917A | Method of producting food products | |
| US1855168A | Loud speaker | |
| US1802818A | Treating storage-battery plates | |
| US1847935A | Sound control apparatus | |
| DE546564C | Loudspeaker with a large, cone-shaped membrane | |
| US1389632A | Acoustic diaphragm | |
| US1271529A | Acoustic device. | |
| US1271528A | Sound-regenerating machine. | |
| US1271527A | Sound-regenerating machine. | |
| CA323093A | Acoustic diaphragm | |
| CA291998A | Loud speaker |