Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4851228 | Multiparticulate controlled porosity osmotic | Kenneth J. Himmelstein, Gerald S. Rork | 1989-07-25 |
| 4814183 | Device for the controlled release of drugs with Donnan-like modulation by charged insoluble resins | — | 1989-03-21 |
| 4795644 | Device for pH independent release of drugs through the Donnan-like influence of charged insoluble resins | — | 1989-01-03 |