Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4997484 | Hydraulic cement and composition employing the same | Richard F. Heitzmann, James Sawyer | 1991-03-05 |
| 4842649 | Cement composition curable at low temperatures | Richard F. Heitzmann, James Sawyer | 1989-06-27 |