John O. Hazen

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Monaca, PA, US

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Patents Grantslast 30 patents

Information Patent Grant
Floor panel for elevated floor assembly
- Patent number 4,656,795
- Issue date Apr 14, 1987
- H. H. Robertson Company
- Raymond E. Albrecht
- E04 - BUILDING
Information Patent Grant
Closure member for an electrical activating assembly
- Patent number 4,656,798
- Issue date Apr 14, 1987
- H. H. Robertson Company
- John O. Hazen
- E04 - BUILDING
Information Patent Grant
Electrical activating assembly and closure member therefor
- Patent number 4,289,921
- Issue date Sep 15, 1981
- H. H. Robertson Company
- Rodney W. Gartner
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Fire-resistant electrical wiring distributing floor structure and m...
- Patent number 4,232,493
- Issue date Nov 11, 1980
- H. H. Robertson Company
- Charles R. Gray
- E04 - BUILDING