Inventor · Modesto, CA, US

David Johnson

70Patents
19h-index
13Co-inventors
81Inventor score

Filing activity: Mar 22, 1979 → Sep 11, 2015

Most-cited inventions

PatentTitleAreaCited byStatus
US5511552A Disposable blood pressure cuff Human Necessities 80 Expired
US5678558A Disposable blood pressure cuff Human Necessities 46 Expired
US4407496A Limb exercise device Human Necessities 44 Expired
US7533432B2 Counterbalance assembly for a fold out ramp Emerging Cross-Sectional Technologies 41 Active
US7063306B2 Electronic winch monitoring system Performing Operations; Transporting 39 Expired
US7681272B2 Counterbalance assembly for a fold out ramp Emerging Cross-Sectional Technologies 39 Active
US7533434B2 Counterbalance assembly for a fold out ramp Emerging Cross-Sectional Technologies 38 Active
US7533433B2 Counterbalance assembly for a fold out ramp Emerging Cross-Sectional Technologies 33 Active
US4868504A Apparatus and method for locating metal objects and minerals in the ground with return of energy from transmitter coil to power supply Physics 32 Expired
US7870631B2 Fold out ramp Emerging Cross-Sectional Technologies 28 Active
US4653269A Heat engine Mechanical Engineering; Lighting; Heating 27 Expired
USD583974S1 Motion-sensing security light and alarm General 27 Expired
US8122553B1 Fold out ramp Emerging Cross-Sectional Technologies 25 Active
US8375496B1 Fold out ramp Human Necessities 24 Active
US8032963B2 Fold out ramp Emerging Cross-Sectional Technologies 24 Active
US7326024B2 Wheelchair lift assembly having a compact stowed profile Emerging Cross-Sectional Technologies 24 Expired
US8250693B1 Fold out ramp Performing Operations; Transporting 24 Active
US7500818B1 Passenger lift with passenger sensitive moveable barrier Emerging Cross-Sectional Technologies 20 Active
US8132281B1 Fold out ramp Emerging Cross-Sectional Technologies 19 Active
US8181300B1 Fold out ramp Emerging Cross-Sectional Technologies 19 Active
US9050229B1 Fold out ramp Performing Operations; Transporting 19 Active
US8505141B1 Compact folding slide-out ramp assembly Performing Operations; Transporting 18 Active
US8230539B2 Fold out ramp Emerging Cross-Sectional Technologies 18 Active
US9271883B2 Ramp assembly with tilt sensor Emerging Cross-Sectional Technologies 17 Active
US4369623A Positive displacement engine with separate combustion chamber Mechanical Engineering; Lighting; Heating 16 Expired

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