Issued Patents All Time
Showing 26–29 of 29 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4209504 | Toothpaste with zeolite polishing agent | Helmut Harth | 1980-06-24 |
| 4208282 | Process for the purification of sewage while recapturing the fatty and albuminous matter in reusable form | — | 1980-06-17 |
| 4193987 | Non-corrosive toothpaste | Helmut Harth | 1980-03-18 |
| 4190301 | Axial bearing for a roller drill bit | Leif Lachonius | 1980-02-26 |