Inventor · Ames, IA, US

Frederic W. Pollman

38Patents
13h-index
16Co-inventors
78Inventor score

Filing activity: May 5, 1977 → Mar 6, 2007

Most-cited inventions

PatentTitleAreaCited byStatus
US4399886A Controls for variable displacement motor and motors Mechanical Engineering; Lighting; Heating 73 Expired
US4478041A Hydraulic motor control Mechanical Engineering; Lighting; Heating 33 Expired
US4401182A Variable displacement hydraulic drive with disconnect Mechanical Engineering; Lighting; Heating 28 Expired
US4476680A Pressure override control Mechanical Engineering; Lighting; Heating 26 Expired
US4341131A Hydromechanical transmissions Mechanical Engineering; Lighting; Heating 26 Expired
US4306467A Hydromechanical transmissions Mechanical Engineering; Lighting; Heating 25 Expired
US6988959B2 Golf putter Human Necessities 24 Expired
US4537364A Constant tension cable reel drive Electricity 23 Expired
US5560203A Transmission control system and method Mechanical Engineering; Lighting; Heating 21 Expired
US7354368B2 Method and means for shifting a hydromechanical transmission Mechanical Engineering; Lighting; Heating 21 Expired
US6533695B2 Hydromechanical transmission Mechanical Engineering; Lighting; Heating 18 Expired
US4232572A Engine-transmission control system Mechanical Engineering; Lighting; Heating 16 Expired
US4102131A Integrated transmission-engine control Mechanical Engineering; Lighting; Heating 15 Expired
US4111003A Hydraulic transmission drive assembly with noise attenuation means Mechanical Engineering; Lighting; Heating 13 Expired
US4246806A Multi-mode hydromechanical transmission shift system Mechanical Engineering; Lighting; Heating 13 Expired
US4426194A Viscosity compensating circuits Mechanical Engineering; Lighting; Heating 12 Expired
US6575872B2 Method and apparatus for making smooth shifts during mode changes of an HMT when using mechanical clutches Mechanical Engineering; Lighting; Heating 12 Expired
US4419610A Reversible regenerating electric vehicle drive Emerging Cross-Sectional Technologies 11 Expired
US6626785B2 Hydromechanical transmission Mechanical Engineering; Lighting; Heating 10 Expired
US6932733B2 Hydromechanical transmission with differential steer Mechanical Engineering; Lighting; Heating 9 Expired
US6860358B1 Utility vehicle having hydrostatic drive Performing Operations; Transporting 8 Expired
US7175537B2 Golf putter with lift angle Human Necessities 8 Expired
US6338689B1 Hydromechanical transmission Mechanical Engineering; Lighting; Heating 7 Expired
US4352367A Electro-hydraulic control structure Emerging Cross-Sectional Technologies 6 Expired
US4462210A Input torque control for a variable displacement hydraulic transmission Mechanical Engineering; Lighting; Heating 5 Expired

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