Sparton Corporation
68Patents
8Active
68Granted
41Portfolio score
Filing activity: Aug 10, 1972 → Aug 6, 2019
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5062344A | Bowline knot in a braided line | Textiles; Paper | 347 | Expired |
| US4892014A | Electronic controller for automatic transmissions | Mechanical Engineering; Lighting; Heating | 92 | Expired |
| US5311581A | Remote meter reading method and apparatus | Emerging Cross-Sectional Technologies | 73 | Expired |
| US5010568A | Remote meter reading method and apparatus | Emerging Cross-Sectional Technologies | 41 | Expired |
| US4628315A | Addressable transducer with improved address signal processing | Electricity | 37 | Expired |
| US5018610A | Service brake and shift lever interlock system | Emerging Cross-Sectional Technologies | 33 | Expired |
| US5129494A | Service brake and shift lever interlock system | Emerging Cross-Sectional Technologies | 28 | Expired |
| US8662441B2 | Unmanned aerial vehicle launch system | Performing Operations; Transporting | 27 | Active |
| US3978903A | Tubeless tire bead seater | Performing Operations; Transporting | 27 | Expired |
| US5379267A | Buoyancy control system | Performing Operations; Transporting | 26 | Expired |
| US5181592A | Shift lever interlock system | Emerging Cross-Sectional Technologies | 24 | Expired |
| US5251877A | Sheave plate and cable assembly for a tire lift/carrier winch | Emerging Cross-Sectional Technologies | 23 | Expired |
| US5125628A | Sheave and cable assembly for a tire lift/carrier winch | Emerging Cross-Sectional Technologies | 20 | Expired |
| US3972018A | Electromechanical transducer | Performing Operations; Transporting | 20 | Expired |
| US5161182A | Remote meter reading method and apparatus | Emerging Cross-Sectional Technologies | 19 | Expired |
| US5415377A | Sheave assembly for a tire lift/carrier winch | Performing Operations; Transporting | 19 | Expired |
| US4709360A | Hydrophone transducer with negative feedback system | Physics | 18 | Expired |
| US5251723A | Service brake and shift lever interlock system | Emerging Cross-Sectional Technologies | 18 | Expired |
| US4399440A | Addressable transducer with a variable frequency oscillation for monitoring a physical quantity | Electricity | 16 | Expired |
| US3953829A | Partially filled fluid damped geophone | Physics | 15 | Expired |
| US4936158A | Transmission shift control mechanism with park lock | Emerging Cross-Sectional Technologies | 15 | Expired |
| US5070427A | Thermal switch for battery protection | Electricity | 14 | Expired |
| US5289907A | Shift lever interlock system | Emerging Cross-Sectional Technologies | 13 | Expired |
| US4986143A | Transmission shift control mechanism with park lock | Emerging Cross-Sectional Technologies | 13 | Expired |
| US4949069A | Dynamic liquid level indicator | Physics | 12 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.