Darrell Darrow

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Norfolk, VA, US

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Patents Grantslast 30 patents

Information Patent Grant
Method of finishing plastic concrete mixture
- Patent number 6,780,369
- Issue date Aug 24, 2004
- Face International Corp.
- Darrell Darrow
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
Method of separating constitutent ingredients of mixtures by staged...
- Patent number 5,814,232
- Issue date Sep 29, 1998
- Samuel A. Face
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
Apparatus of staged resonant frequency vibration of concrete
- Patent number 5,527,175
- Issue date Jun 18, 1996
- Samuel A. Face
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
Method of staged resonant frequency vibration of concrete
- Patent number 5,520,862
- Issue date May 28, 1996
- Samuel A. Face
- B28 - WORKING CEMENT, CLAY, OR STONE