Issued Patents All Time
Showing 26–27 of 27 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5665231 | Full flow/bypass filter assembly | Brian J. Langsdorf, Ralph Allen Knopp | 1997-09-09 |
| 4445538 | Bidirectional control valve | — | 1984-05-01 |
Showing 26–27 of 27 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5665231 | Full flow/bypass filter assembly | Brian J. Langsdorf, Ralph Allen Knopp | 1997-09-09 |
| 4445538 | Bidirectional control valve | — | 1984-05-01 |