Helmut H. Wirschal

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York, PA, US

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Patents Grantslast 30 patents

Information Patent Grant
Radial gate having fine tuning of flow control
- Patent number 4,394,098
- Issue date Jul 19, 1983
- Allis-Chalmers Corporation
- Helmut H. Wirschal
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Flap-gate for bottom discharge control in canals having ice problems
- Patent number 4,357,121
- Issue date Nov 2, 1982
- Allis-Chalmers Corporation
- Helmut H. Wirschal
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING