Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4539408 | Process for the preparation of sulphoalkyl quaternary salts | Helmut Kampfer, Marie Hase | 1985-09-03 |
| 4504668 | Process for the preparation of N-sulfoalkyl quaternary salts of nitrogen heterocyclics | Helmut Kampfer, Marie Hase | 1985-03-12 |
| 4308390 | Process for the production of sulphoalkyl quaternary salts | Helmut Kampfer | 1981-12-29 |