Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D412551 | End cap for a cylindrical filter | Roger A. Buttery, Richard Gutman | 1999-08-03 |
| 5779903 | Filter assemblies and end caps for filter assemblies | Roger A. Buttery, Richard Gutman | 1998-07-14 |