Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4884571 | Cranial perforator with reentrant cutting segment | — | 1989-12-05 |
| RE32870 | Sewer relief valve | James M. Houston | 1989-02-21 |
| 4803982 | Cranial perforator | — | 1989-02-14 |
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4884571 | Cranial perforator with reentrant cutting segment | — | 1989-12-05 |
| RE32870 | Sewer relief valve | James M. Houston | 1989-02-21 |
| 4803982 | Cranial perforator | — | 1989-02-14 |