Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4813859 | Apparatus for molding expandable polystyrene foam articles | Calvin P. Bullard | 1989-03-21 |
| 4801361 | Method and apparatus for molding expandable polystyrene foam articles | Calvin P. Bullard | 1989-01-31 |