Issued Patents All Time
Showing 51–75 of 85 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5814219 | Pleated filter having a planar sheet of randomly arranged filaments to maintain pleat spacing | Francis A. Friedmann, Daniel T. Risch | 1998-09-29 |
| 5792247 | Integrated resonator and filter apparatus | Gary R. Gillingham, Daniel T. Risch, Joseph C. Tokar, Bernard A. Matthys, Edward A. Steinbrueck | 1998-08-11 |
| D396098 | Conical filter | Gary R. Gillingham, Joseph C. Tokar, Daniel T. Risch, Jim C. Rothman, Steven A. Carter | 1998-07-14 |
| 5772883 | Slanted inline filter | Jim C. Rothman, Gary R. Gillingham, Joseph C. Tokar, Daniel T. Risch, Fred H. Wahlquist +1 more | 1998-06-30 |
| 5426269 | Muffler with catalytic converter arrangement; and method | Marty Barris, Douglas E. Flemming, James C. Rothman, Peter A. Betts, John S. Wiese +1 more | 1995-06-20 |
| 5400590 | Filter cartridge arrangement | Bruce Hoppenstedt, Edward A. Steinbrueck, Daniel T. Risch, Richard P. Ryan | 1995-03-28 |
| 5388400 | Diesel engine exhaust regenerable filter system | Bruce Hoppenstedt, Ervin Fuchs, Edward A. Steinbrueck | 1995-02-14 |
| 5373733 | Exhaust filter backpressure indicator | Ervin Fuchs, Edward A. Steinbrueck | 1994-12-20 |
| 5355973 | Muffler with catalytic converter arrangement; and method | Marty Barris, Douglas E. Flemming, James C. Rothman, Peter A. Betts | 1994-10-18 |
| 5342519 | Fluid filter cartridge with replaceable filter element | Francis A. Friedmann | 1994-08-30 |
| 5293742 | Trap apparatus with tubular filter element | Gary R. Gillingham, James C. Rothman, Kelly C. Robertson, Marty Barris, Peter A. Betts | 1994-03-15 |
| 5246205 | Valve assembly and use | Gary R. Gillingham, James C. Rothman, Peter A. Betts | 1993-09-21 |
| 5246472 | Apparatus for filtering engine exhaust | John T. Herman, Mervin E. Wright, Bruce Hoppenstedt, James A. LeBlanc | 1993-09-21 |
| 5224973 | Filter cartridge for trap apparatus | Bruce Hoppenstedt | 1993-07-06 |
| 5116083 | Clamp for coupling and sealing pipe joints | Gary R. Gillingham, Fred H. Wahlquist | 1992-05-26 |
| 5101095 | Diesel engine gas filter with electrical heater | Eugene Wilson, Douglas E. Flemming, Ed Steinbrueck | 1992-03-31 |
| 5053062 | Ceramic foam prefilter for diesel exhaust filter system | Marty Barris | 1991-10-01 |
| 5053603 | Electrical resistance heater | Eugene Wilson, Douglas E. Flemming, Ed Steinbrueck | 1991-10-01 |
| 5024054 | Engine exhaust system with sequential loading of multiple filters | Marty Barris | 1991-06-18 |
| 4986069 | Engine exhaust particle trap captured mass sensor | Marty Barris | 1991-01-22 |
| 4969537 | Muffler assembly and method of manufacture | John Campbell, William L. Burchett, John S. Wiese, John Hiemstra, Timothy A. Bethke | 1990-11-13 |
| 4899540 | Muffler apparatus with filter trap and method of use | Douglas E. Flemming | 1990-02-13 |
| 4867768 | Muffler apparatus with filter trap and method of use | Bruce Hoppenstedt | 1989-09-19 |
| 4851015 | Muffler apparatus with filter trap and method of use | Douglas E. Flemming, Edward A. Steinbrueck, Bruce Hoppenstedt | 1989-07-25 |
| 4832661 | Apparatus and method for maintaining alternator output above predetermined levels | Douglas E. Flemming | 1989-05-23 |