| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 6 | |
| #2 | United Kingdom | 4 | |
| #3 | United States | 2 | |
| #4 | Austria | 1 | |
| #5 | Spain | 1 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology | |
| #2 | Medical technology |
| # | Technology | |
|---|---|---|
| #1 | Loudspeakers and microphones | |
| #2 | Diagnosis and surgery |
| # | Name | Total Patents |
|---|---|---|
| #1 | Chisholm Charles Logan | 13 |
| Publication | Filing date | Title |
|---|---|---|
| CA128965A | Signal | |
| GB191008332A | Improvements in Telephone System and Individual Transmitter. | |
| CA127150A | Telephone transmitter | |
| CA125735A | Telephone receiver | |
| GB190809800A | Improvements in Electro-magnetic Sound Recording Apparatus. | |
| US891233A | Sound-recording apparatus. | |
| GB190711164A | Improvements in Speaking Machines. | |
| CA113432A | Telephone transmitter | |
| CA105603A | Talking machine | |
| US881547A | Reproducer. | |
| CA96266A | Sound reproducing mechanism | |
| GB190517637A | Improvements in Pitch Indicating Attachments for Sound Reproducing Machines. |