Issued Patents All Time
Showing 526–537 of 537 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4299731 | Large pore volume olefin polymerization catalysts | John J. Meister | 1981-11-10 |
| 4297460 | Treatment of silica | Melvin B. Welch | 1981-10-27 |
| 4295997 | SO.sub.2 Activation of supported chromium oxide catalysts | Melvin B. Welch | 1981-10-20 |
| 4294724 | Titanium impregnated silica-chromium catalysts | — | 1981-10-13 |
| 4277587 | Sulfiding and reoxidation of chromium catalyst | Melvin B. Welch | 1981-07-07 |
| 4248735 | Treatment of silica | Melvin B. Welch | 1981-02-03 |
| 4247421 | Activation of supported chromium oxide catalysts | Melvin B. Welch | 1981-01-27 |
| 4238369 | Chromium-silica catalysts by hydrothermal treating | Melvin B. Welch, Alonzo G. Kitchen | 1980-12-09 |
| 4211863 | Polymer slurry catalyst residue deactivation | John D. Hottovy, Melvin B. Welch | 1980-07-08 |
| 4194073 | Olefin polymerization | — | 1980-03-18 |
| 4190457 | Preparation of inorganic xerogels | — | 1980-02-26 |
| 4182815 | Reduction and reoxidation of cogel or self-reduced catalyst | Melvin B. Welch | 1980-01-08 |