Issued Patents All Time
Showing 26–27 of 27 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D397648 | Tire tread | Keith Eric Grabo, Warren Lee Croyle, Marc Christopher Nowacki, David Ray Hubbell | 1998-09-01 |
| D384923 | Tire tread | Warren Lee Croyle, Keith Eric Grabo | 1997-10-14 |