Issued Patents 1989
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4878494 | Cardio-valve assist unit and method for performing cardio-valve replacement surgery | Dale W. Richardson, J. Donald Hill | 1989-11-07 |
| 4852200 | Device for cleaning electric knives | Dale W. Richardson, Lawrence M. Silverman | 1989-08-01 |
| 4839818 | Magnet wire oven control apparatus | — | 1989-06-13 |
| 4834097 | Cardio-valve assist unit and method for performing cardio-valve replacement surgery | Dale W. Richardson, J. Donald Hill | 1989-05-30 |
| 4808971 | Alarm apparatus | Randall C. Graham | 1989-02-28 |