HOFFCO Incorporated
33Patents
2Active
33Granted
37Portfolio score
Filing activity: May 27, 1975 → Mar 14, 2013 · 2 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4188719A | Lawn trimmer chain saw attachment | Mechanical Engineering; Lighting; Heating | 46 | Expired |
| US6006434A | Quick-release component connector for lawn tool | Emerging Cross-Sectional Technologies | 45 | Expired |
| US4226021A | Shaft assembly for lawn trimmer | Emerging Cross-Sectional Technologies | 44 | Expired |
| US5647810A | Drive arm-engaging roller for centrifugal clutch | Mechanical Engineering; Lighting; Heating | 35 | Expired |
| US4035994A | Lawn mower blade control apparatus | Human Necessities | 32 | Expired |
| US5377774A | Variable speed drive system | Performing Operations; Transporting | 31 | Expired |
| US5597060A | Centrifugal actuator for centrifugal clutch | Mechanical Engineering; Lighting; Heating | 29 | Expired |
| USD252130S | Power driven lawn trimmer | General | 27 | Expired |
| US4148141A | Lawn trimmer cutter head | Human Necessities | 27 | Expired |
| US4102214A | Variable-speed pulley and clutch | Mechanical Engineering; Lighting; Heating | 22 | Expired |
| US4316355A | Combined flywheel and clutch mechanism for lawn mower blade | Human Necessities | 21 | Expired |
| US5437356A | Centrifugal clutch | Mechanical Engineering; Lighting; Heating | 18 | Expired |
| US4416107A | Lawn mower blade control mechanism | Human Necessities | 18 | Expired |
| US4126928A | Method of making a shaft assembly | Emerging Cross-Sectional Technologies | 17 | Expired |
| US5048616A | Garden tiller tine assembly | Human Necessities | 17 | Expired |
| US5411122A | Cone ramp clutch | Mechanical Engineering; Lighting; Heating | 15 | Expired |
| US4413468A | Lawn mower blade retainer | Human Necessities | 14 | Expired |
| US5246403A | Pivoting belt tensioning device | Mechanical Engineering; Lighting; Heating | 13 | Expired |
| US4148173A | Lawn mower blade control apparatus | Human Necessities | 13 | Expired |
| US4326368A | Clutch and brake for rotary lawn mower | Human Necessities | 12 | Expired |
| US4633978A | Brake caliper includes mechanical actuator with camming device and manual wear compensator | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4335585A | Lawn trimmer construction | Mechanical Engineering; Lighting; Heating | 12 | Expired |
| US5427217A | Steering clutch brake assembly | Human Necessities | 11 | Expired |
| US4277936A | Combined flywheel and clutch driver, and control and warning device | Human Necessities | 11 | Expired |
| US6155940A | Adjustable cam weights for torque converter | Mechanical Engineering; Lighting; Heating | 9 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.