Torotrak (Development) Limited
76Patents
32Active
76Granted
41Portfolio score
Filing activity: Sep 2, 1988 → Jul 3, 2014 · 26 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5401221A | Transmission of the toroidal-race, rolling-traction type having a mixer and a reducer epicyclic type gearing with clutches brakes | Mechanical Engineering; Lighting; Heating | 172 | Expired |
| US5564998A | Continuously-variable-ratio-transmissions | Mechanical Engineering; Lighting; Heating | 152 | Expired |
| US8142323B2 | Continuously variable transmission | Mechanical Engineering; Lighting; Heating | 140 | Active |
| US5766105A | Continuously variable transmission capable of torque control | Mechanical Engineering; Lighting; Heating | 104 | Expired |
| US5895337A | Continuously-variable-ratios transmissions | Mechanical Engineering; Lighting; Heating | 82 | Expired |
| US8924111B2 | Electronic controller for a continuously variable transmission and a method of control of a continuously variable transmission | Mechanical Engineering; Lighting; Heating | 54 | Active |
| US5643121A | Continuously-variable-ratio transmissions | Mechanical Engineering; Lighting; Heating | 45 | Expired |
| US5090951A | Hydraulic control circuits for continuously-variable-ratio transmissions | Mechanical Engineering; Lighting; Heating | 39 | Expired |
| US4922788A | Continuously variable transmission | Mechanical Engineering; Lighting; Heating | 37 | Expired |
| US5453061A | Continuously-variable ratio transmission of the toroidal race rolling traction type | Mechanical Engineering; Lighting; Heating | 36 | Expired |
| US5395292A | Transmissions of the toroidal-race rolling-traction type | Mechanical Engineering; Lighting; Heating | 34 | Expired |
| US7491149B2 | Fluid supply arrangement for a rolling-traction continuously variable ratio transmission unit | Mechanical Engineering; Lighting; Heating | 33 | Expired |
| US5938557A | CVT Control System | Mechanical Engineering; Lighting; Heating | 32 | Expired |
| US5242337A | Continuously-variable-ratio transmissions of the toroidal-race rolling-traction type | Emerging Cross-Sectional Technologies | 31 | Expired |
| US7563194B2 | Control method and controller for a motor vehicle drive train | Performing Operations; Transporting | 31 | Expired |
| US5667456A | Continuously-variable-ratio transmission having an improved starting arrangement | Mechanical Engineering; Lighting; Heating | 31 | Expired |
| US7407459B2 | Continuously variable ratio transmission system | Mechanical Engineering; Lighting; Heating | 30 | Expired |
| US5564993A | Continously-variable-ratio transmission of the toroidal-race rolling-traction type | Mechanical Engineering; Lighting; Heating | 30 | Expired |
| US7160226B2 | Continuously variable transmission and method of operation thereof | Mechanical Engineering; Lighting; Heating | 30 | Expired |
| US6030310A | Variator control system | Mechanical Engineering; Lighting; Heating | 29 | Expired |
| US5423727A | Transmission of the toroidal-race rolling-traction type | Mechanical Engineering; Lighting; Heating | 29 | Expired |
| US5971885A | Roller assembly | Mechanical Engineering; Lighting; Heating | 28 | Expired |
| US6626793B1 | Hydraulic control circuit for a continuously-variable-transmission | Mechanical Engineering; Lighting; Heating | 27 | Expired |
| US6979276B2 | Control system and method for a continuously variable transmission | Mechanical Engineering; Lighting; Heating | 27 | Expired |
| US5217418A | Drivelines for wheeled vehicles | Mechanical Engineering; Lighting; Heating | 26 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.