Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6582211 | Discharge valve | Frank S. Wallis, Walter T. Grassbaugh, Jeffrey L. Berning, Clyde C. Verhoff, Norman G. Beck | 2003-06-24 |
| 6428292 | Discharge valve | Frank S. Wallis, Walter T. Grassbaugh, Jeffrey L. Berning, Clyde C. Verhoff, Norman G. Beck | 2002-08-06 |
| 6171084 | Discharge valve | Frank S. Wallis, Walter T. Grassbaugh, Jeffrey L. Berning, Clyde C. Verhoff, Norman G. Beck | 2001-01-09 |
| 5960825 | Laser hardened reed valve | Marc J. Scancarello, Brad A. Schulze | 1999-10-05 |