Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4810578 | Surface modified pigments and methods for producing same and elastomers containing same | Paul I. Prescott | 1989-03-07 |
| 4810580 | Silicon nitride coated clays and method of preparation | — | 1989-03-07 |