Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE37369 | Slow release coolant filter | R. Douglas Hudgens | 2001-09-18 |
| 5772873 | Slow release coolant filter | R. Douglas Hudgens | 1998-06-30 |
| 5662799 | Slow release coolant filter | R. Douglas Hudgens | 1997-09-02 |
| 5171430 | Plastic filter | Donald W. Beach, Udo E. Holzhausen, Lawrence B. Feldhaus, Monroe L. Newton, Steve F. Robbins +1 more | 1992-12-15 |
| D298051 | Air filter housing for mounting on an internal combustion engine | Emilio Ambasz | 1988-10-11 |
| 4753266 | Valve assembly | Steven F. Robbins, John R. Smith | 1988-06-28 |
| 4619677 | Disposable air filter assembly and method of making same | Preston Lane, James V. Dieringer, Emilio Ambafz | 1986-10-28 |
| 4440193 | Valve assembly | — | 1984-04-03 |