Automatic Switch Company
85Patents
40Active
85Granted
46Portfolio score
Filing activity: Jan 29, 1975 → Jan 3, 2023 · 5 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5070252A | Automatic transfer switch | Electricity | 89 | Expired |
| US5032812A | Solenoid actuator having a magnetic flux sensor | Electricity | 85 | Expired |
| US5957158A | Visual position indicator | Emerging Cross-Sectional Technologies | 72 | Expired |
| US4921208A | Proportional flow valve | Mechanical Engineering; Lighting; Heating | 66 | Expired |
| US5565832A | Solenoid with magnetic control of armature velocity | Electricity | 54 | Expired |
| US5538220A | Molded solenoid valve and method of making it | Electricity | 52 | Expired |
| US4247077A | Slow-opening valve operated by a solenoid pump | Mechanical Engineering; Lighting; Heating | 51 | Expired |
| US5294089A | Proportional flow valve | Mechanical Engineering; Lighting; Heating | 47 | Expired |
| US5887847A | Digitally controllable flow rate valve | Physics | 47 | Expired |
| US4501297A | Rotary valve | Emerging Cross-Sectional Technologies | 47 | Expired |
| US5199462A | Valve having rocker valve member and isolation diaphragm | Emerging Cross-Sectional Technologies | 45 | Expired |
| US4405867A | System for transferring a load between two power sources without interruption of power to the load | Electricity | 44 | Expired |
| US5676342A | Proportional flow valve with diaphragm pressure member | Mechanical Engineering; Lighting; Heating | 43 | Expired |
| US6003552A | Rocker valve for sealing large orifices | Emerging Cross-Sectional Technologies | 42 | Expired |
| US4244554A | Springless diaphragm valve | Mechanical Engineering; Lighting; Heating | 41 | Expired |
| US5205323A | Valve and operator therefor | Emerging Cross-Sectional Technologies | 41 | Expired |
| US3936782A | Automatic transfer switch | Electricity | 40 | Expired |
| US4021678A | Automatic transfer switch | Electricity | 39 | Expired |
| US4157461A | Automatic transfer switch and bypass switch arrangement | Electricity | 38 | Expired |
| US5748432A | Method and apparatus for preventing coil induced delay in a automatic transfer switch | Electricity | 37 | Expired |
| US5918852A | Wide flow range proportional flow valve | Mechanical Engineering; Lighting; Heating | 37 | Expired |
| US5449142A | Two-way cartridge valve for aggresive media | Mechanical Engineering; Lighting; Heating | 37 | Expired |
| US6155531A | Proportional control value | Mechanical Engineering; Lighting; Heating | 36 | Expired |
| US4683453A | Solenoid actuator with fastener | Electricity | 34 | Expired |
| US5959448A | Optically isolated line voltage sensing circuit | Physics | 33 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.