Inventor · Cortland, NY, US

Franklin R. Smith

47Patents
18h-index
17Co-inventors
78Inventor score

Filing activity: Jul 13, 1987 → Oct 11, 2018

Most-cited inventions

PatentTitleAreaCited byStatus
US5107804A Variable camshaft timing for internal combustion engine Mechanical Engineering; Lighting; Heating 95 Expired
US5002023A Variable camshaft timing for internal combustion engine Mechanical Engineering; Lighting; Heating 93 Expired
US6361458B1 Hydraulic tensioner with pressure relief valve Mechanical Engineering; Lighting; Heating 51 Expired
US5361735A Belt driven variable camshaft timing system Mechanical Engineering; Lighting; Heating 49 Expired
US7000580B1 Control valves with integrated check valves Mechanical Engineering; Lighting; Heating 40 Expired
US5577970A Hydraulic tensioner with a pressure relief valve Mechanical Engineering; Lighting; Heating 33 Expired
US6481402B1 Variable camshaft timing system with pin-style lock between relatively oscillatable components Emerging Cross-Sectional Technologies 31 Expired
US4869708A Sprocket retention/chain guide assembly Mechanical Engineering; Lighting; Heating 30 Expired
US5046460A Variable camshaft timing for internal combustion engine Mechanical Engineering; Lighting; Heating 30 Expired
US8800515B1 Cam torque actuated variable camshaft timing device with a bi-directional oil pressure bias circuit Mechanical Engineering; Lighting; Heating 29 Active
US8356583B2 Variable camshaft timing device with hydraulic lock in an intermediate position Mechanical Engineering; Lighting; Heating 27 Active
US6814038B2 Spool valve controlled VCT locking pin release mechanism Mechanical Engineering; Lighting; Heating 25 Expired
US5367992A Variable camshaft timing system for improved operation during low hydraulic fluid pressure Mechanical Engineering; Lighting; Heating 23 Expired
US6666181B2 Hydraulic detent for a variable camshaft timing device Mechanical Engineering; Lighting; Heating 22 Expired
US4862770A Two-speed alternator drive Electricity 21 Expired
US6745735B2 Air venting mechanism for variable camshaft timing devices Mechanical Engineering; Lighting; Heating 20 Expired
US4862845A Variable camshaft timing system Mechanical Engineering; Lighting; Heating 20 Expired
US6941913B2 Spool valve controlled VCT locking pin release mechanism Mechanical Engineering; Lighting; Heating 18 Expired
US6668778B1 Using differential pressure control system for VCT lock Mechanical Engineering; Lighting; Heating 15 Expired
US5718650A Hydraulic tensioner with porous vent Mechanical Engineering; Lighting; Heating 14 Expired
US7124722B2 Remote variable camshaft timing control valve with lock pin control Mechanical Engineering; Lighting; Heating 12 Expired
US5207192A Variable camshaft timing system utilizing square-edged spool valve Mechanical Engineering; Lighting; Heating 12 Expired
US6312351A Hydraulic tensioner with pivotal mount Mechanical Engineering; Lighting; Heating 11 Expired
US5152261A Variable camshaft timing system utilizing changes in length of portions of a chain or belt Mechanical Engineering; Lighting; Heating 9 Expired
US8820280B2 Variable camshaft timing mechanism with a default mode Mechanical Engineering; Lighting; Heating 7 Active

Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.