David H. Dumas

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Hong Kong, HK

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Patents Grantslast 30 patents

Information Patent Grant
Flame spread barrier made from mechanically delaminated vermiculite...
- Patent number 5,176,794
- Issue date Jan 5, 1993
- Hercules Incorporated
- Herbert T. Conner
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES