C. Warren Duncan

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Santa Ana, CA, US

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Patents Grantslast 30 patents

Information Patent Grant
Core drilling system with torque shaft
- Patent number 8,647,030
- Issue date Feb 11, 2014
- C. Warren Duncan
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
Manhole cover frame removal saw
- Patent number 7,703,856
- Issue date Apr 27, 2010
- C. Warren Duncan
- B66 - HOISTING LIFTING HAULING
Information Patent Grant
Hole coring system with lever arm
- Patent number 7,658,242
- Issue date Feb 9, 2010
- C. Warren Duncan
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Hole coring system
- Patent number 7,484,578
- Issue date Feb 3, 2009
- U.S. Saws, Inc.
- C. Warren Duncan
- E21 - EARTH DRILLING MINING
Information Patent Grant
Pipe beveling system
- Patent number 7,082,656
- Issue date Aug 1, 2006
- C. Warren Duncan
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR

Patents Applicationslast 30 patents

Information Patent Application
Core Drilling System with Torque Shaft
- Publication number 20110135412
- Publication date Jun 9, 2011
- C. Warren Duncan
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Application
Hole coring system with lever arm
- Publication number 20080179105
- Publication date Jul 31, 2008
- C. Warren Duncan
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Application
Hole coring system
- Publication number 20070181342
- Publication date Aug 9, 2007
- U.S. Saws, Inc.
- C. Warren Duncan
- E21 - EARTH DRILLING MINING