Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7273550 | Filter assemblies with valves | Richard Gutman, Kenneth Roy Weight | 2007-09-25 |
| D412551 | End cap for a cylindrical filter | Karl S. Smith, Richard Gutman | 1999-08-03 |
| 5779903 | Filter assemblies and end caps for filter assemblies | Karl S. Smith, Richard Gutman | 1998-07-14 |
| 5468382 | Depth filter media | Nigel J. D. Cook, Kenneth Roy Weight, Richard Gutman, Michael Grimes | 1995-11-21 |
| 5429742 | Plastic frame filter unit for a stack assembly | Richard Gutman, John A. G. Tolcher | 1995-07-04 |
| 5290445 | Filtering apparatus | — | 1994-03-01 |
| 5286381 | Filter assemblies | Charles N. Rothwell | 1994-02-15 |
| 5279731 | Depth filter media | Nigel J. D. Cook, Kenneth Roy Weight, Richard Gutman | 1994-01-18 |