Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5421531 | Slack limiter post | Gregory H. Johnson | 1995-06-06 |
| 4642722 | Spring mechanism for lid of video cassette | Mark W. Weavers | 1987-02-10 |
| 4564878 | Cassette removable piece | Mark W. Weavers, Ken'ichi Yamasaki | 1986-01-14 |
| 4518135 | Slack limiter for a magnetic tape cassette | — | 1985-05-21 |
| 4405097 | Cassette with a slack limiter tab | — | 1983-09-20 |
| 4323207 | Latch assembly for a video tape cassette | — | 1982-04-06 |
| 4204654 | Tape guide assemblies for video cassettes | — | 1980-05-27 |