Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4485192 | Plastisol sealing gaskets puffed with hollow discrete spheres | David A. Gibbs, Robert H. Hofeldt | 1984-11-27 |
| 4278718 | Sealing compositions for minimizing soluble iron migration | Robert H. Hofeldt | 1981-07-14 |