Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5685036 | Alternating pressure mattress system and method | Allen Kopfstein, Jack Wilkerson | 1997-11-11 |
| D264816 | Phonograph cartridge box | Sanford Drelinger, Lazzaro Padron | 1982-06-08 |
| 4326285 | Stereo phonograph cartridge | Edward Peterhoff | 1982-04-20 |
| 4320492 | Variable weight phonograph cartridge | Sanford Drelinger | 1982-03-16 |