Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE33100 | Dental compositions incorporating glass ionomers | Robert L. Ibsen, Donald R. Pacropis | 1989-10-24 |
| 4859716 | Microfilled dental composite and method for making it | Robert L. Ibsen | 1989-08-22 |