Issued Patents All Time
Showing 26–31 of 31 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4651461 | Fishing rod handle | — | 1987-03-24 |
| 4530485 | Valve | John H. Yonker, Otto J. Granhaug | 1985-07-23 |
| 4524830 | Landing nipple with subsurface safety valve | — | 1985-06-25 |
| 4494608 | Well injection system | John H. Yonker, Robert L. Thurman | 1985-01-22 |
| 4248755 | Composition and method for sizing textiles | — | 1981-02-03 |
| 4189416 | Composition containing an aqueous solution of a mixed salt of an interpolymer of styrene/maleic anhydride/vinyl acetate | — | 1980-02-19 |