Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5964809 | Polyetheretherketone (PEEK) retaining ring for an acetabular cup assembly | Ruey Y. Lin, Ashok K. Chopra, Allen P. Levine | 1999-10-12 |
| 5782930 | Polyetheretherketone (PEEK) retaining ring for an acetabular cup assembly | Ruey Y. Lin, Ashok K. Chopra, Allen P. Levine | 1998-07-21 |
| 4802228 | Amplifier filter system for speech therapy | Carl W. Asp | 1989-01-31 |