Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4861808 | Glass/poly (carboxylic acid) cement compositions | Richard W. Billington | 1989-08-29 |
| 4814362 | Glasses and poly(carboxylic acid) cement compositions containing them | Richard W. Billington | 1989-03-21 |
| 4797431 | Glass/poly(carboxylic acid) cement compositions | Richard W. Billington | 1989-01-10 |