Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5184258 | Helical scan magnetic tape recorder with capstan assisted vacuum threading | Frederic F. Grant, Vincent J. Piarulli, Robert Ryerson | 1993-02-02 |
| RE30762 | Method and apparatus for video signal recording | — | 1981-10-06 |
| RE30756 | Method and apparatus for video signal recording | — | 1981-09-29 |
| 4275424 | Scanning type magnetic recorder and cassette | — | 1981-06-23 |