David B. Hartwell

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Minneapolis, MN, US

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Patents Grantslast 30 patents

Information Patent Grant
Cutting method for stone laminate panels
- Patent number 9,102,078
- Issue date Aug 11, 2015
- Bellcomb, Inc.
- David B. Hartwell
- B28 - WORKING CEMENT, CLAY, OR STONE

Patents Applicationslast 30 patents

Information Patent Application
Cutting Method for Stone Laminate Panels
- Publication number 20140190464
- Publication date Jul 10, 2014
- Bellcomb, Inc.
- David B. Hartwell
- B28 - WORKING CEMENT, CLAY, OR STONE