Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4923753 | Controlled-release compositions for acids | Wilhelm E. Walles | 1990-05-08 |
| 4915912 | Apparatus for the generation of sulfur trioxide reagent and sulfonation of the surface of polymeric resins | Wilhelm E. Walles | 1990-04-10 |
| 4902493 | Process for the generation of sulfur trioxide reagent and sulfonation of the surface of polymeric resins | Wilhelm E. Walles, David R. Near | 1990-02-20 |
| 4879805 | Method for making a circuit interrupter device | John R. D'Entremont | 1989-11-14 |
| 4861250 | Mold sulfonation system | Wilhem E. Walles | 1989-08-29 |
| 4780698 | Circuit interrupter device and method for making | John R. D'Entremont | 1988-10-25 |
| 4756844 | Controlled-release composition having a membrane comprising submicron particles | Wilhelm E. Walles | 1988-07-12 |
| 4741401 | Method for treating subterranean formations | Wilhelm E. Walles, Trevor Williamson | 1988-05-03 |