| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 3 | |
| #2 | Canada | 2 | |
| #3 | Australia | 1 | |
| #4 | China | 1 | |
| #5 | EPO (European Patent Office) | 1 | |
| #6 | France | 1 | |
| #7 | United Kingdom | 1 | |
| #8 | Japan | 1 | |
| #9 | Mexico | 1 | |
| #10 | WIPO (World Intellectual Property Organization) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology | |
| #2 | Control | |
| #3 | Consumer goods |
| # | Technology | |
|---|---|---|
| #1 | Teaching materials | |
| #2 | Special information storage | |
| #3 | Hairstyling and cosmetic |
| # | Name | Total Patents |
|---|---|---|
| #1 | Copeland Peter | 10 |
| #2 | Charles Nehrke | 1 |
| #3 | Piitaa Koopurando | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB9219986D0 | Teaching aid | |
| US4315286A | Recorders | |
| US4383280A | Recorder with timing channel | |
| CA1144638A | Recorders | |
| JPS5459911A | Recorder | |
| US2424112A | Slideable and pivoted cover for containers |