Issued Patents 1997
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D388035 | Tire tread | Richard Heinen, Pierre Harpes, Bernard Jean Francois Croissant | 1997-12-23 |
| D382520 | Tire tread | Pierre Harpes, Richard Heinen | 1997-08-19 |
| D379791 | Tire tread | Richard Heinen | 1997-06-10 |
| D379441 | Tire tread | William Urbano Villamizar, Richard Heinen, Maurice Graas, Michel Constant | 1997-05-27 |