| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 4 | |
| #2 | United Kingdom | 4 | |
| #3 | United States | 3 |
| # | Technology | |
|---|---|---|
| #1 | Amplification control | |
| #2 | Electric discharge tubes | |
| #3 | Loudspeakers and microphones | |
| #4 | Amplifiers | |
| #5 | Building materials |
| # | Name | Total Patents |
|---|---|---|
| #1 | Snow Harold A | 3 |
| #2 | Stuart Ballantine | 2 |
| #3 | Cobb Howard L | 1 |
| #4 | Ballantine Stuart | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1946964A | Magnetic material and process of making the same | |
| GB377692A | Improvements in or relating to electric discharge tubes | |
| GB376737A | Improvements in electric wave amplifying apparatus | |
| GB382945A | Improvements in or relating to electric discharge tubes | |
| US1869331A | Automatic control for audion amplifiers | |
| US1844456A | Audion circuit | |
| CA315739A | Vacuum tube | |
| CA358637A | Audion amplifier control | |
| CA323964A | Vacuum tube | |
| CA347332A | Cathode ray tube |