Helmut Wulf
24Patents
12h-index
17Co-inventors
74Inventor score
Filing activity: Nov 1, 1971 → Mar 16, 1990
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4213396A | Traffic system with drive channel and road vehicles mechanically cross guided-therein | Performing Operations; Transporting | 50 | Expired |
| US4271764A | Vehicle adapted to be guided on tracks for the public local passenger traffic with pivotal rear axle and longitudinal guide members for such axle | Emerging Cross-Sectional Technologies | 36 | Expired |
| US3944250A | Automatically inflatable gas cushion for the protection of the passengers of vehicles | Performing Operations; Transporting | 29 | Expired |
| US5016705A | Passenger compartment heating system, in particular bus heating system | Performing Operations; Transporting | 19 | Expired |
| US4296796A | Heat transfer system | Emerging Cross-Sectional Technologies | 19 | Expired |
| US4097752A | Power supply of installations driven by internal combustion engines, especially of motor vehicles | Emerging Cross-Sectional Technologies | 18 | Expired |
| US4393922A | Engine unit with lubricant cooling | Emerging Cross-Sectional Technologies | 16 | Expired |
| US4532894A | Heating arrangement for electrically driven vehicles | Mechanical Engineering; Lighting; Heating | 15 | Expired |
| US4206605A | Installation for the power assist of actuating devices in motor vehicles, especially in a hydraulic brake system | Performing Operations; Transporting | 15 | Expired |
| US4693301A | Method for heating a road by means of geothermally fed heating installation as well as a road-heating installation for carrying out the method | Emerging Cross-Sectional Technologies | 13 | Expired |
| US4567817A | Exhaust-gas offtake for a track-guided vehicle propelled by combustion-energy | Performing Operations; Transporting | 13 | Expired |
| US4026580A | Temperature maintaining device for safety gas cushion | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4140173A | Heating device | Emerging Cross-Sectional Technologies | 10 | Expired |
| US4773476A | Heat pipe of aluminum, steel or gray cast iron | Emerging Cross-Sectional Technologies | 7 | Expired |
| US4087047A | Heating unit for automotive vehicles | Performing Operations; Transporting | 5 | Expired |
| US4092931A | Positive guide mechanism for road vehicles with non-turnable wheels | Performing Operations; Transporting | 5 | Expired |
| US4389945A | Transverse guide roller arrangement for a track guided vehicle | Performing Operations; Transporting | 4 | Expired |
| US4287830A | Vehicle adapted to be guided on tracks for the public local passenger traffic with pivotal rear axle and longitudinal guide members for such axle | Performing Operations; Transporting | 4 | Expired |
| US4067247A | Steering mechanism with derivative action timer | Performing Operations; Transporting | 3 | Expired |
| US4613073A | Compound glass pane construction and method for heating the same | Performing Operations; Transporting | 2 | Expired |
| US4936225A | Track-guidable omnibus | Performing Operations; Transporting | 1 | Expired |
| US3947057A | Monitoring system for a steering wheel mounted air bag gas source | Performing Operations; Transporting | 1 | Expired |
| US4295520A | Heat transfer system | Mechanical Engineering; Lighting; Heating | 1 | Expired |
| US4270405A | Steering mechanism with time derivation | Emerging Cross-Sectional Technologies | 1 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.