David E. Walker

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Dundas, CA

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Patents Grantslast 30 patents

Information Patent Grant
Pressure relief or back pressure valve
- Patent number 5,944,050
- Issue date Aug 31, 1999
- 1219737 Ontario Inc.
- David E. Walker
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Pressure relief or back pressure valve
- Patent number 5,857,486
- Issue date Jan 12, 1999
- 1219737 Ontario Inc.
- David E. Walker
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...