Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4361194 | Bearing system for a downhole motor | Jacob Chow | 1982-11-30 |
| 4352400 | Drill bit | Richard H. Grappendorf, Gordon G. Sirrine | 1982-10-05 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4361194 | Bearing system for a downhole motor | Jacob Chow | 1982-11-30 |
| 4352400 | Drill bit | Richard H. Grappendorf, Gordon G. Sirrine | 1982-10-05 |