Rotron, Inc.
18Patents
0Active
18Granted
33Portfolio score
Filing activity: Feb 5, 1976 → Aug 11, 2000
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4089618A | Fan with noise reduction | Emerging Cross-Sectional Technologies | 72 | Expired |
| US4553075A | Simple brushless DC fan motor with reversing field | Electricity | 50 | Expired |
| US4633110A | Motor with stator on printed circuit assembly | Electricity | 49 | Expired |
| US4563622A | Simple brushless DC fan motor | Electricity | 40 | Expired |
| US4365187A | Brushless D.C. motor | Electricity | 29 | Expired |
| US4618806A | Ironless, brushless DC motor with wave-winding | Electricity | 26 | Expired |
| US4438362A | Self-starting, direct current motor with permanent magnets of varied magnetic strength | Electricity | 25 | Expired |
| US5546295A | Electrical power converter, power supply, and inverter with series-connected switching circuits | Electricity | 24 | Expired |
| US4484114A | Self-starting brushless DC motor | Electricity | 22 | Expired |
| US5656494A | Biofilter with modular trays | Emerging Cross-Sectional Technologies | 18 | Expired |
| US4506218A | Condition sensing arrangement for ac machines | Electricity | 17 | Expired |
| US4494028A | Integral coaxial commutation and rotor magnets and apparatus and method for making same | Electricity | 16 | Expired |
| US5595910A | Biofilter with modular trays | Emerging Cross-Sectional Technologies | 15 | Expired |
| US5117167A | Commutating energy suppression circuit for an electronically commutated DC motor | Electricity | 14 | Expired |
| US4542768A | Pressure relief valve | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4845411A | Brushless DC motor and encoding technique | Electricity | 10 | Expired |
| US6453504B1 | Power driven wiper system for outside vehicle mirrors | Performing Operations; Transporting | 8 | Expired |
| US4564793A | Brushless DC motor with improved starting | Electricity | 4 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.