David Silverman

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Pittsburgh, PA, US

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Patents Grantslast 30 patents

Information Patent Grant
Drain cleaning apparatus with restricted reverse function
- Patent number 7,935,192
- Issue date May 3, 2011
- General Wire Spring Co.
- David Silverman
- B08 - CLEANING

Patents Applicationslast 30 patents

Information Patent Application
DRAIN CLEANING APPARATUS WITH RESTRICTED REVERSE FUNCTION
- Publication number 20100139696
- Publication date Jun 10, 2010
- GENERAL WIRE SPRING CO.
- David Silverman
- B08 - CLEANING