Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9334189 | Copper red frits and pigments comprising silica and at least one of cupric oxide and cuprous oxide | Enos A. Axtell, III, George E. Sakoske, Andreas Schulz, Lothar Heck, Dietrich Speer +1 more | 2016-05-10 |
| 8946102 | Copper red frits and pigments comprising silica and at least one of cupric oxide and cuprous oxide | Enos A. Axtell, III, George E. Sakoske, Andreas Schulz, Lothar Heck, Dietrich Speer +1 more | 2015-02-03 |
| 5008223 | Grayish-black encapsulated pigments and method of their production | Dietrich Speer, Akos Kiss, Peter Kleinschmit | 1991-04-16 |
| 4874433 | Methods of preparing encapsulated pigments | Akos Kiss, Peter Kleinschmit, Guenter Halbritter, Jenny Horst | 1989-10-17 |