Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5597985 | Acoustically inactive corrugated structure | Karl U. Ingard | 1997-01-28 |
| 5209259 | Fluid distribution system having noise reduction mechanism | Karl U. Ingard | 1993-05-11 |
| 5014816 | Silencer for gas induction and exhaust systems | Karl U. Ingard, Mark Elden Schuchardt | 1991-05-14 |
| 4832147 | Sound reduction membrane | Karl U. Ingard, Stephen P. Scheinberg | 1989-05-23 |
| 4479509 | Fluid control apparatus | Allan B. Hughes | 1984-10-30 |
| 4429714 | Control valve | Allan B. Hughes | 1984-02-07 |