Helmut Hetzel

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Schwabisch Gmund, DE

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Patents Grantslast 30 patents

Information Patent Grant
Rotary gate valve for hydraulic servo-assisted steering systems
- Patent number 5,107,752
- Issue date Apr 28, 1992
- Zahnradfabrik Friedrichshafen, AG
- Dieter Elser
- B62 - LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
Information Patent Grant
Rotary slide valve for hydraulic auxiliary power steering
- Patent number 5,086,687
- Issue date Feb 11, 1992
- Zahnradfabrik Friedrichshafen, AG
- Dieter Elser
- B62 - LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
Information Patent Grant
Rotary slide valve for hydraulic auxiliary power steerings
- Patent number 4,848,402
- Issue date Jul 18, 1989
- Zahnradfabrik Friedrichshafen, AG
- Dieter Elser
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...