John R. Hacker
74Patents
18h-index
49Co-inventors
84Inventor score
Filing activity: Apr 25, 1978 → Jul 19, 2022
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| 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.