Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6308804 | Quick connect wheelchair brake lock | — | 2001-10-30 |
| 5799756 | Surelock wheelchair brakes | John S. Roberts | 1998-09-01 |
| 4547910 | Low friction bearing surfaces and structures particularly for artificial prosthetic joints | Robert L. Johnson | 1985-10-22 |
| 4535486 | Low friction bearing surfaces and structures particularly for artificial prosthetic joints | Robert L. Johnson | 1985-08-20 |