Inventor · Yokohama, JP

Hiroshi Masunaga

33Patents
11h-index
32Co-inventors
75Inventor score

Filing activity: Jul 8, 1999 → Mar 8, 2021

Most-cited inventions

PatentTitleAreaCited byStatus
US6257665A Chair Emerging Cross-Sectional Technologies 132 Expired
US7837272B2 Chair and the structure for stretching a mesh over an element of the chair Human Necessities 108 Expired
US6626497B2 Backrest of a chair Human Necessities 107 Expired
US8172332B2 Chair backrest device Human Necessities 67 Active
US7097249B2 Tilting mechanism for a chair and chair having the same Human Necessities 57 Expired
US7726740B2 Backrest-tilting device Human Necessities 51 Active
US7243993B2 Tilting mechanism for a chair and a chair having the same Human Necessities 34 Active
US9578968B2 Chair Human Necessities 33 Active
US8191970B2 Backrest device in a chair Human Necessities 28 Active
US7246859B2 Chair Human Necessities 20 Active
US9603451B2 Height adjustment device in fixture, and armrest device for chair provided with height adjustment device Human Necessities 18 Active
US6687106B1 Power module Electricity 9 Expired
US6535406B1 Three-level inverter controller reducing commutation loop inductance Electricity 6 Expired
US8777321B2 Stretching structure of chair upholstery material Human Necessities 5 Active
US10263457B2 Uninterruptible power supply device and uninterruptible power supply system using the same Electricity 4 Active
US11019928B2 Armrest and chair Mechanical Engineering; Lighting; Heating 4 Active
US9755457B2 Uninterruptible power supply apparatus Electricity 3 Active
US10932575B2 Armrest and chair Human Necessities 3 Active
US10050469B2 Uninterruptible power supply device and uninterruptible power supply system using the same Electricity 3 Active
US10966530B2 Backrest, lumbar support, chair, attachment structure for optional member, optional member, and furniture Human Necessities 3 Active
US10159350B2 Chair Human Necessities 2 Active
US10264886B2 Reaction force mechanism and chair using same Human Necessities 1 Active
US11439239B2 Backrest and chair Human Necessities 1 Active
US8172323B2 Locking device for a movable member in a chair Emerging Cross-Sectional Technologies 1 Active
US10756567B2 Uninterruptible power supply device Electricity 1 Active

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