Thomas D. Grau

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Sioux City, IA, US

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Patents Grantslast 30 patents

Information Patent Grant
Concrete pipe manufacturing machinery and methods
- Patent number 7,125,239
- Issue date Oct 24, 2006
- International Pipe Machinery Corporation
- Thomas D. Grau
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
Vibrators
- Patent number 5,433,523
- Issue date Jul 18, 1995
- International Pipe Machinery Corp.
- Thomas D. Grau
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
Combination counter rotating packerhead and vibrator assembly and m...
- Patent number 5,364,578
- Issue date Nov 15, 1994
- International Pipe Machinery Corp.
- Thomas D. Grau
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
Apparatus for making lined pipe
- Patent number 5,139,404
- Issue date Aug 18, 1992
- International Pipe Machinery Corporation
- Thomas D. Grau
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
Method of forming lined pipe
- Patent number 5,028,368
- Issue date Jul 2, 1991
- International Pipe Machinery Corporation
- Thomas D. Grau
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
Vibrator type concrete pipe making machines having combined lubrica...
- Patent number 4,861,252
- Issue date Aug 29, 1989
- International Pipe Machinery Corp.
- Thomas D. Grau
- B06 - GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL

Patents Applicationslast 30 patents

Information Patent Application
Concrete pipe manufacturing machinery and method
- Publication number 20070035065
- Publication date Feb 15, 2007
- Thomas D. Grau
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Application
Concrete pipe manufacturing machinery and methods
- Publication number 20040195725
- Publication date Oct 7, 2004
- Thomas D. Grau
- B28 - WORKING CEMENT, CLAY, OR STONE