Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4863514 | Material for facing denture | Josef Rothaut | 1989-09-05 |
| 4859412 | Method of producing alloyed powders for dental amalgams | Doris Hathaway, Gernot Schock | 1989-08-22 |
| 4836984 | Dentures and alloys for use in same | Rudolf Wagner, Harry Schiwiora, Manfred Stumke | 1989-06-06 |
| 4806306 | Attachments in the field of dental technology made of noble metal alloys with melting ranges above 1500 degree celsius | Rudi Steinke, Harry Schiwiora | 1989-02-21 |