Issued Patents All Time
Showing 26–28 of 28 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D438621 | Indirect ophthalmoscopy lens retaining ring | Donald A. Volk | 2001-03-06 |
| D434851 | Indirect ophthalmoscopy lens straight retaining ring | Donald A. Volk | 2000-12-05 |
| D434498 | Indirect ophthalmoscopy lens two piece retaining ring | Donald A. Volk | 2000-11-28 |