Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4606946 | Method of applying interleaving material to glass sheets | Joseph D. Kelly, Helmut Franz | 1986-08-19 |
| 4568605 | Acidified powdered interleaving | Helmut Franz, Joseph D. Kelly | 1986-02-04 |
| 4530889 | Acidified powdered interleaving | Helmut Franz, Joseph D. Kelly | 1985-07-23 |
| 4529648 | Method of applying interleaving material to glass sheets | Joseph D. Kelly, Helmut Franz | 1985-07-16 |
| 4489106 | Two step interleaving method | Helmut Franz, Joseph D. Kelly | 1984-12-18 |
| 4487807 | Mixed acid stain inhibitor | Joseph D. Kelly, Helmut Franz | 1984-12-11 |
| 4447496 | Organotin surface treatment and interleaving material for glass sheets | Helmut Franz, Joseph D. Kelly | 1984-05-08 |
| 4360544 | Organotin surface treatment and interleaving material for glass sheets | Helmut Franz, Joseph D. Kelly | 1982-11-23 |
| 4254046 | Method for making dimethyltin difluoride | Helmut Franz, James H. Hanlon | 1981-03-03 |