Issued Patents All Time
Showing 26–47 of 47 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6748912 | Method to vent air from a cam phaser with a center mounted spool valve | Roger T. Simpson | 2004-06-15 |
| 6745735 | Air venting mechanism for variable camshaft timing devices | — | 2004-06-08 |
| 6668778 | Using differential pressure control system for VCT lock | — | 2003-12-30 |
| 6666181 | Hydraulic detent for a variable camshaft timing device | Braman Wing | 2003-12-23 |
| 6644258 | VCT mechanism having a lock pin adapted to release at a pressure higher than the pressure required to hold the lock pin in the released position | — | 2003-11-11 |
| 6622677 | Worm gear driven variable cam phaser | Roger T. Simpson | 2003-09-23 |
| 6623390 | Hydraulic tensioner with pivotal mount | Roger T. Simpson | 2003-09-23 |
| 6481402 | Variable camshaft timing system with pin-style lock between relatively oscillatable components | Roger T. Simpson | 2002-11-19 |
| 6361458 | Hydraulic tensioner with pressure relief valve | — | 2002-03-26 |
| 6312351 | Hydraulic tensioner with pivotal mount | Roger T. Simpson | 2001-11-06 |
| 5718650 | Hydraulic tensioner with porous vent | Stanley K. Dembosky | 1998-02-17 |
| 5577970 | Hydraulic tensioner with a pressure relief valve | Kevin B. Todd | 1996-11-26 |
| 5367992 | Variable camshaft timing system for improved operation during low hydraulic fluid pressure | Roger P. Butterfield, Curt A. Wykstra | 1994-11-29 |
| 5361735 | Belt driven variable camshaft timing system | Roger P. Butterfield, Stanley K. Dembosky | 1994-11-08 |
| 5207192 | Variable camshaft timing system utilizing square-edged spool valve | — | 1993-05-04 |
| 5152261 | Variable camshaft timing system utilizing changes in length of portions of a chain or belt | Roger P. Butterfield | 1992-10-06 |
| 5107804 | Variable camshaft timing for internal combustion engine | Thomas Becker, Roger P. Butterfield, Stanley K. Dembosky | 1992-04-28 |
| 5046460 | Variable camshaft timing for internal combustion engine | Roger P. Butterfield, Stanley K. Dembosky | 1991-09-10 |
| 5002023 | Variable camshaft timing for internal combustion engine | Roger P. Butterfield | 1991-03-26 |
| 4869708 | Sprocket retention/chain guide assembly | Peter Hoffmann | 1989-09-26 |
| 4862770 | Two-speed alternator drive | — | 1989-09-05 |
| 4862845 | Variable camshaft timing system | Roger P. Butterfield | 1989-09-05 |