Twin Disc, Inc.
🏢 View company profile →73Patents
28Active
73Granted
45Portfolio score
Filing activity: Jan 8, 1975 → Apr 11, 2023 · 4 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4459873A | Marine propulsion system | Emerging Cross-Sectional Technologies | 215 | Expired |
| US4483684A | Torsional impulse damper for direct connection to universal joint drive shaft | Mechanical Engineering; Lighting; Heating | 141 | Expired |
| US7617026B2 | Programmable trim control system for marine applications | Performing Operations; Transporting | 78 | Active |
| US4836809A | Control means for marine propulsion system | Performing Operations; Transporting | 73 | Expired |
| US3951008A | Power transmitting mechanism for starting a high inertia load and having retarder means for auxiliary starting motor | Emerging Cross-Sectional Technologies | 44 | Expired |
| US4549443A | Multi-speed reversible transmission of countershaft construction | Emerging Cross-Sectional Technologies | 37 | Expired |
| US4090414A | Transmission control system for shuttle type vehicles | Emerging Cross-Sectional Technologies | 37 | Expired |
| US4338832A | System for shiftable multi-speed hydraulically operated power transmission and electronic controller therein | Mechanical Engineering; Lighting; Heating | 36 | Expired |
| US4734861A | Electronic control for motor vehicle transmission | Electricity | 32 | Expired |
| US6390866B1 | Hydraulic cylinder with anti-rotation mounting for piston rod | Mechanical Engineering; Lighting; Heating | 30 | Expired |
| US4372434A | Interleaved friction plate clutch having means to prevent plate wobble | Mechanical Engineering; Lighting; Heating | 24 | Expired |
| US6443286B1 | Modulatable power transmission clutch and a marine transmission | Mechanical Engineering; Lighting; Heating | 23 | Expired |
| US4186829A | Modulatable power transmission clutch | Mechanical Engineering; Lighting; Heating | 22 | Expired |
| US4275607A | Power transmission having power take-off shaft and fluid control means therefor | Mechanical Engineering; Lighting; Heating | 22 | Expired |
| US5016724A | Inter-axle differential having a friction-type biasing clutch and wheel slip sensing control means therefor | Performing Operations; Transporting | 22 | Expired |
| US4442730A | Vehicle transmission system and a single lever control device therefor | Emerging Cross-Sectional Technologies | 21 | Expired |
| US4308729A | Universal joint slip spline connection having concentric one-way valves | Mechanical Engineering; Lighting; Heating | 21 | Expired |
| US4324387A | Power delivery system having a pressure modulated hydrodynamic retarder for controlling a load | Performing Operations; Transporting | 20 | Expired |
| US4451238A | Shaft brake for marine propulsion system | Mechanical Engineering; Lighting; Heating | 18 | Expired |
| US4015488A | Digital electronic controller for power transmission | Mechanical Engineering; Lighting; Heating | 18 | Expired |
| US4419086A | Trunnion seal and cross venting system for a cardan-type universal joint | Emerging Cross-Sectional Technologies | 15 | Expired |
| US5127858A | Control means for marine engines and transmissions | Performing Operations; Transporting | 14 | Expired |
| US4305710A | Ship propulsion transmission having a torque converter for driving a fixed pitch propeller in reverse | Emerging Cross-Sectional Technologies | 14 | Expired |
| US4012908A | Torque converter having adjustably movable stator vane sections | Mechanical Engineering; Lighting; Heating | 14 | Expired |
| US5651288A | Hydraulically operated friction clutch with shift shock prevention and method of using same | Emerging Cross-Sectional Technologies | 13 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.