John G. Powell

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Northridge, CA, US

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Patents Grantslast 30 patents

Information Patent Grant
Siren
- Patent number 4,807,203
- Issue date Feb 21, 1989
- Southern California Edison Co.
- John G. Powell
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Grant
Siren
- Patent number 4,649,853
- Issue date Mar 17, 1987
- Southern California Edison Company, Inc.
- John G. Powell
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Grant
Method of sealing between relatively movable components
- Patent number 4,615,530
- Issue date Oct 7, 1986
- Southern California Edison Company, Inc.
- John G. Powell
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Grant
Siren
- Patent number 4,558,656
- Issue date Dec 17, 1985
- Southern California Edison Company, Inc.
- John G. Powell
- G10 - MUSICAL INSTRUMENTS ACOUSTICS