Inventor · Edina, MN, US

John R. Hacker

74Patents
18h-index
49Co-inventors
84Inventor score

Filing activity: Apr 25, 1978 → Jul 19, 2022

Most-cited inventions

PatentTitleAreaCited byStatus
US8272516B2 Fluid filter system Performing Operations; Transporting 502 Active
US5897676A Reverse flow air filter arrangement and method Performing Operations; Transporting 215 Expired
US6322602A Reverse flow air filter arrangement Performing Operations; Transporting 98 Expired
US5938804A Reverse flow air filter arrangement and method Performing Operations; Transporting 85 Expired
US6004366A Reverse flow air filter arrangement and method Performing Operations; Transporting 74 Expired
US7160451B2 Liquid filter assembly for use with treatment agent and methods Mechanical Engineering; Lighting; Heating 71 Expired
US6413289B2 Reverse flow air filter arrangement Performing Operations; Transporting 56 Expired
US6258145A Reverse flow air filter arrangement Performing Operations; Transporting 53 Expired
US6521009B2 Reverse flow air filter arrangement and method Performing Operations; Transporting 48 Expired
US8167142B2 Filter cartridge for liquid filtration; assembly; and, methods Performing Operations; Transporting 42 Expired
US6322697A Oil filter assembly Performing Operations; Transporting 32 Expired
US6384369B1 Liquid filter construction and methods Performing Operations; Transporting 31 Expired
US4138181A Releasable electrical connector Electricity 28 Expired
USD648822S1 Fuel filter General 22 Expired
US7455707B2 Reverse flow air filter arrangement and method Performing Operations; Transporting 21 Expired
USD646750S1 Fuel filter General 20 Expired
US5177888A Discharge chute assembly for snowthrower Emerging Cross-Sectional Technologies 19 Expired
US8419938B2 Fluid filter system Emerging Cross-Sectional Technologies 19 Active
US7556155B2 Fluid filter and methods Performing Operations; Transporting 18 Expired
US7955502B2 Liquid filter arrangement and methods Performing Operations; Transporting 18 Active
US7628280B2 Liquid filter arrangement; components; and methods Performing Operations; Transporting 14 Active
US9776116B2 Liquid filter, assembly, system, and methods Emerging Cross-Sectional Technologies 13 Active
US8231793B2 Combination filter arrangement and method Emerging Cross-Sectional Technologies 12 Active
USD646350S1 Filter General 12 Expired
USD656577S1 Fuel filter General 11 Expired

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