Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4879022 | Ore flotation process and use of mixed hydrocarbyl dithiophosphoric acids and salts thereof | Edward P. Richards, Douglas R. Shaw | 1989-11-07 |
| 4808344 | Process for recovering and purifying unreacted acrylonitrile from the waste stream in the manufacture of 2-acrylamido-2-methyl propane sulfonic acid | Douglas J. Hallenburg, James L. Hambrick | 1989-02-28 |