George C. Ludwig
33Patents
11h-index
8Co-inventors
64Inventor score
Filing activity: Feb 2, 1973 → May 18, 1989
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4718647A | Pneumatic counterbalance with dual force | Mechanical Engineering; Lighting; Heating | 32 | Expired |
| US4408751A | Multi-chamber temperature compensated pneumatic counterbalance | Mechanical Engineering; Lighting; Heating | 30 | Expired |
| US4635908A | Pneumatic counterbalance | Mechanical Engineering; Lighting; Heating | 24 | Expired |
| US4768895A | Captive ball and socket joint | Emerging Cross-Sectional Technologies | 22 | Expired |
| US4854554A | Pneumatic spring structure with dual output force and pressure decay compensation and method of operation | Emerging Cross-Sectional Technologies | 19 | Expired |
| US4921225A | Pneumatic spring structure with dual output force and pressure decay compensation and method of operation | Fixed Constructions | 18 | Expired |
| US4310142A | Fuel pressure regulator assembly | Emerging Cross-Sectional Technologies | 16 | Expired |
| US4142677A | Fuel vapor vent valve | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4079750A | Vacuum delay valve | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4570912A | Pneumatic spring counterbalance having improved damping structure | Mechanical Engineering; Lighting; Heating | 11 | Expired |
| US4339743A | Multiple resistance element assembly and method of making same | Emerging Cross-Sectional Technologies | 11 | Expired |
| US4434761A | Fuel flow regulator control for a diesel engine with exhaust gas driven turbocharger | Emerging Cross-Sectional Technologies | 9 | Expired |
| US4200269A | Self adjusting shock absorber | Emerging Cross-Sectional Technologies | 9 | Expired |
| US3948232A | Altitude compensated nonlinear vacuum spark advance control system | Mechanical Engineering; Lighting; Heating | 8 | Expired |
| US4010721A | Vacuum delay/relief valve | Emerging Cross-Sectional Technologies | 8 | Expired |
| US4451964A | Method of making a pressurized pneumatic counterbalance | Emerging Cross-Sectional Technologies | 8 | Expired |
| US4204561A | Fuel pressure regulator assembly | Emerging Cross-Sectional Technologies | 8 | Expired |
| US3995607A | Vacuum retard delay valve | Emerging Cross-Sectional Technologies | 7 | Expired |
| US3933166A | Altitude compensated vacuum regulating valve | Emerging Cross-Sectional Technologies | 7 | Expired |
| US4047696A | Butterfly valve | Emerging Cross-Sectional Technologies | 6 | Expired |
| US4156518A | Electric vacuum valve | Mechanical Engineering; Lighting; Heating | 5 | Expired |
| US4788747A | Counterbalance apparatus with transverse pneumatic spring and bellcrank linkage | Emerging Cross-Sectional Technologies | 5 | Expired |
| US4363309A | Valve, particularly crossover passage valve | Emerging Cross-Sectional Technologies | 5 | Expired |
| US4005821A | Thermomechanical vacuum regulator using bimetallic position sensing | Emerging Cross-Sectional Technologies | 5 | Expired |
| US3935843A | Nonlinear vacuum spark advance system | Emerging Cross-Sectional Technologies | 5 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.