Michael Duffield
15Patents
8h-index
18Co-inventors
69Inventor score
Filing activity: Oct 9, 1997 → Sep 6, 2018
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5967921A | Hydraulic chain tensioner with molded plastic body | Mechanical Engineering; Lighting; Heating | 47 | Expired |
| US6311655A | Multi-position variable cam timing system having a vane-mounted locking-piston device | Emerging Cross-Sectional Technologies | 45 | Expired |
| US6763791B2 | Cam phaser for engines having two check valves in rotor between chambers and spool valve | Mechanical Engineering; Lighting; Heating | 40 | Expired |
| US6374787B2 | Multi-position variable camshaft timing system actuated by engine oil pressure | Mechanical Engineering; Lighting; Heating | 30 | Expired |
| US6247434A | Multi-position variable camshaft timing system actuated by engine oil | Mechanical Engineering; Lighting; Heating | 27 | Expired |
| US6612952B1 | Blade tensioner having spring blade cantilevered from distal end of arm | Mechanical Engineering; Lighting; Heating | 25 | Expired |
| US6883481B2 | Torsional assisted multi-position cam indexer having controls located in rotor | Mechanical Engineering; Lighting; Heating | 20 | Expired |
| US8574740B2 | Molded frame with corrugated cooling fin for air-cooled battery | Emerging Cross-Sectional Technologies | 13 | Active |
| US9065158B2 | Corrugated fin and frame assembly for battery cooling | Emerging Cross-Sectional Technologies | 5 | Active |
| US6814037B1 | Variable camshaft timing for internal combustion engine with actuator locking | Emerging Cross-Sectional Technologies | 4 | Expired |
| US8673480B2 | Support feature for joining of battery cell tabs | Emerging Cross-Sectional Technologies | 3 | Active |
| US10096813B2 | Battery design with bussing integral to battery assembly | Emerging Cross-Sectional Technologies | 1 | Active |
| US8221936B2 | Method and apparatus for attachment of fuel cell stack manifold | Emerging Cross-Sectional Technologies | 0 | Active |
| US10615397B2 | Battery design with bussing integral to battery assembly | Emerging Cross-Sectional Technologies | 0 | Active |
| US9406918B2 | Support feature for joining of battery cell tabs | Emerging Cross-Sectional Technologies | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.