Roy S. Colby
30Patents
11h-index
25Co-inventors
75Inventor score
Filing activity: Nov 19, 1993 → Mar 20, 2020
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7183667B2 | Method and apparatus for power inverter synchronization | Electricity | 185 | Expired |
| US5929400A | Self commissioning controller for field-oriented elevator motor/drive system | Electricity | 84 | Expired |
| US5379864A | Magnetic system for elevator car lateral suspension | Performing Operations; Transporting | 29 | Expired |
| US6163472A | Elevator DC motor drive with unity power factor, including regeneration | Emerging Cross-Sectional Technologies | 26 | Expired |
| US7015597B2 | Power regulator for power inverter | Emerging Cross-Sectional Technologies | 24 | Expired |
| US7570074B2 | Electronic overload relay for mains-fed induction motors | Electricity | 16 | Active |
| US5883344A | Automatic calibration of field-oriented elevator motor drive parameters using standstill motor measurements | Electricity | 15 | Expired |
| US5880415A | Automatic calibration of current regulator control compensation for an elevator motor drive with locked rotor | Performing Operations; Transporting | 14 | Expired |
| US5814774A | Elevator system having a force-estimation or position-scheduled current command controller | Mechanical Engineering; Lighting; Heating | 13 | Expired |
| US7079365B2 | Electrical fault detection system | Electricity | 13 | Expired |
| US5909018A | Automatic fine-tuning of rotor time constant and magnetizing current in field-oriented elevator motor drive | Performing Operations; Transporting | 12 | Expired |
| US7769552B2 | Method and apparatus for estimating induction motor rotor temperature | Electricity | 11 | Active |
| US5880416A | Automatic calibration of motor speed loop gain for an elevator motor control | Performing Operations; Transporting | 10 | Expired |
| US8102140B2 | Method and apparatus for estimating induction motor electrical parameters | Electricity | 10 | Active |
| US6452360B1 | Auto tuning and parameter identification of a control circuit | Electricity | 9 | Expired |
| US8800309B2 | Method of automatically detecting an anomalous condition relative to a nominal operating condition in a vapor compression system | Mechanical Engineering; Lighting; Heating | 9 | Active |
| US7680234B2 | Method and apparatus for signal phase locking | Electricity | 8 | Active |
| US5821656A | Magnetic bearing with reduced control-flux-induced rotor loss | Mechanical Engineering; Lighting; Heating | 7 | Expired |
| US8035322B2 | Methods and apparatuses for estimating transient slip | Physics | 6 | Active |
| US8373379B2 | Methods and devices for estimation of induction motor inductance parameters | Electricity | 5 | Active |
| US7766231B2 | Devices and methods for determining the amount of individual usage of a shared commodity | Emerging Cross-Sectional Technologies | 3 | Active |
| US11128253B1 | Rotor resistance based motor thermal protection | Electricity | 3 | Active |
| US7112898B2 | Real-time digital voltage sag compensator | Electricity | 2 | Expired |
| US8131482B2 | Methods and apparatus for estimating rotor slots | Physics | 2 | Active |
| US5896954A | Automatic fine tuning of rotor time constant in field-oriented elevator motor drive | Performing Operations; Transporting | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.