Roger P. Engdahl

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Costa Mesa, CA, US

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Patents Grantslast 30 patents

Information Patent Grant
Automatic safety shutoff valve
- Patent number 6,112,764
- Issue date Sep 5, 2000
- Engdahl; Paul D.
- Paul D. Engdahl
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Seismic initiator for earthquake shutoff valves and the like
- Patent number 5,307,699
- Issue date May 3, 1994
- Engdahl; Paul D.
- Paul D. Engdahl
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Automatic safety shutoff valve
- Patent number 5,209,454
- Issue date May 11, 1993
- Engdahl; Paul D.
- Paul D. Engdahl
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Intergrating, indicating, and controlling seismometer
- Patent number 5,144,598
- Issue date Sep 1, 1992
- Engdahl; Paul D.
- Paul D. Engdahl
- G01 - MEASURING TESTING
Information Patent Grant
Seismic displacement recorder for base-isolated structures
- Patent number 4,684,958
- Issue date Aug 4, 1987
- Engdahl; Paul D.
- Paul D. Engdahl
- G01 - MEASURING TESTING