Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6965677 | Focus fader with adjustable tension | Edward R. Dubinsky | 2005-11-15 |
| 4509159 | Aluminum-aluminum oxide stylus arm | George Alexandrovich, Sr., J. Raymond Edinger, Alan Hofer | 1985-04-02 |
| D278147 | Phonograph cartridge | Frank Frielingsdorf, Alan Hofer | 1985-03-26 |