Charles N. Klettenberg

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Maple Grove, MN, US

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Patents Grantslast 30 patents

Information Patent Grant
System and method for manufacturing concrete blocks
- Patent number 7,695,268
- Issue date Apr 13, 2010
- Marshall Concrete
- Charles N. Klettenberg
- B28 - WORKING CEMENT, CLAY, OR STONE

Patents Applicationslast 30 patents

Information Patent Application
System and method for manufacturing concrete blocks
- Publication number 20080258340
- Publication date Oct 23, 2008
- Charles N. Klettenberg
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Application
Dry-cast concrete block
- Publication number 20070193181
- Publication date Aug 23, 2007
- Charles N. Klettenberg
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Application
Method of making a composite masonry block
- Publication number 20040218985
- Publication date Nov 4, 2004
- Charles N. Klettenberg
- B28 - WORKING CEMENT, CLAY, OR STONE