Howard L. Johnson
36Patents
11h-index
18Co-inventors
72Inventor score
Filing activity: Feb 4, 1974 → Mar 12, 2014
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4345436A | Control for load sharing pumps | Mechanical Engineering; Lighting; Heating | 46 | Expired |
| US3990477A | Force balanced valve spool | Emerging Cross-Sectional Technologies | 43 | Expired |
| US3987622A | Load controlled fluid system having parallel work elements | Mechanical Engineering; Lighting; Heating | 23 | Expired |
| US4245816A | Flow force balanced spool valve | Emerging Cross-Sectional Technologies | 18 | Expired |
| US3974742A | Lock valve assembly | Emerging Cross-Sectional Technologies | 16 | Expired |
| US4084609A | Cartridge type check valve | Emerging Cross-Sectional Technologies | 16 | Expired |
| US4204459A | Combination check and flow control valve for hydraulic systems | Emerging Cross-Sectional Technologies | 14 | Expired |
| US4249842A | Self loading multiple bale trailer | Human Necessities | 14 | Expired |
| US4218454A | N-.alpha.Methylcyclopropylmethyl derivatives of normorphine and noroodeine, and analgesic compositions and methods employing the normorphine derivatives | Chemistry; Metallurgy | 12 | Expired |
| US4232986A | Trailer with multiple bale elevating apparatus and method of bale handling | Human Necessities | 11 | Expired |
| US4024797A | Spring centered balanced resolver valve | Emerging Cross-Sectional Technologies | 11 | Expired |
| US3991571A | Fluid system of a work vehicle having fluid combining means and signal combining means | Mechanical Engineering; Lighting; Heating | 11 | Expired |
| US4269843A | N-Sec-alkyl analogs of norcodeine and normorphine and analgesic compositions and methods employing the normorphine derivatives | Chemistry; Metallurgy | 10 | Expired |
| US3998053A | Three-pump - three-circuit fluid system of a work vehicle having controlled fluid-combining means | Mechanical Engineering; Lighting; Heating | 10 | Expired |
| US4033236A | All hydraulic motor grader circuitry | Emerging Cross-Sectional Technologies | 9 | Expired |
| US4147034A | Hydraulic system with priority control | Mechanical Engineering; Lighting; Heating | 8 | Expired |
| US4196588A | Margin valve | Emerging Cross-Sectional Technologies | 8 | Expired |
| US3987704A | Fluid system of a work vehicle having fluid combining means | Mechanical Engineering; Lighting; Heating | 7 | Expired |
| US4034564A | Piston pump assembly having load responsive controls | Mechanical Engineering; Lighting; Heating | 7 | Expired |
| US4114516A | Anti-cavitation and pressure modulating relief valve for controlling hydraulic cylinders | Emerging Cross-Sectional Technologies | 7 | Expired |
| US3959141A | Fluid filter system | Performing Operations; Transporting | 7 | Expired |
| US4367884A | Removable gooseneck for trailers | Performing Operations; Transporting | 6 | Expired |
| US4451474A | T-Butyl-phenoxy-alkylene esters of benzoic and nicotinic acids, compositions containing same and their antihistaminic method of use | Chemistry; Metallurgy | 4 | Expired |
| US4184410A | Low pressure signal driven flow control system | Emerging Cross-Sectional Technologies | 3 | Expired |
| US4142282A | Method for assembling a cartridge-type valve | Emerging Cross-Sectional Technologies | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.