Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4221690 | Coating composition for acceptor sheets in carbonless copying | Kurt Riecke | 1980-09-09 |
| 4191403 | Donor material for carbonless copying | Guido Dessauer, Kurt Riecke | 1980-03-04 |