Frank W. Dowdican

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Portland, OR, US

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Patents Grantslast 30 patents

Information Patent Grant
Sewer line trap priming assembly and antisiphoning conduit componen...
- Patent number 5,797,419
- Issue date Aug 25, 1998
- C. H. Perrott, Inc.
- Charles H. Perrott
- E03 - WATER SUPPLY SEWERAGE
Information Patent Grant
Sewer line multiple trap priming system and method
- Patent number 5,678,588
- Issue date Oct 21, 1997
- C. H. Perrott, Inc.
- Charles H. Perrott
- E03 - WATER SUPPLY SEWERAGE