| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 16 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology | |
| #2 | Measurement | |
| #3 | Electrical machinery and energy | |
| #4 | Mechanical elements | |
| #5 | Basic communication technologies | |
| #6 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Loudspeakers and microphones | |
| #2 | Measuring volume | |
| #3 | Gearing | |
| #4 | Electric discharge tubes | |
| #5 | Television | |
| #6 | Electromechanical clocks | |
| #7 | Amplifiers | |
| #8 | Mechanically-driven clocks | |
| #9 | Unspecified technologies | |
| #10 | Analysing materials |
| # | Name | Total Patents |
|---|---|---|
| #1 | Rockwell Edward A | 7 |
| #2 | Deventer Harry R Van | 5 |
| #3 | Shively John J | 2 |
| #4 | Rockweil Edward A | 1 |
| #5 | Harris Arthur W D | 1 |
| #6 | Capicotto James V | 1 |
| #7 | Mckeown Samuel C | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2131787A | Power transmitting device | |
| US1995689A | Power transmitting device | |
| US2028475A | Light conversion system | |
| US2033302A | Viscosimeter | |
| US2021212A | Time switch | |
| US1995702A | Thermionic tube | |
| US1932461A | Loud speaker | |
| US1932460A | Speaker amplifier | |
| US1932459A | Loud speaker | |
| US2021211A | Combination clock and radio receiver assembly | |
| US1985390A | Sound reproducing device | |
| US1995461A | Dual sound reproducing device | |
| US1985389A | Sound reproducing device | |
| US1932677A | Thermionic device | |
| US1949627A | Vacuum gauge | |
| US2011162A | Liquid level indicator |