David C. Robertson

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Bear, DE, US

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Patents Grantslast 30 patents

Information Patent Grant
Hollow filament product
- Patent number 4,446,024
- Issue date May 1, 1984
- E. I. Du Pont de Nemours and Company
- Richard A. Baker
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information Patent Grant
Separation device of rigid porous inorganic hollow filament and use...
- Patent number 4,105,548
- Issue date Aug 8, 1978
- E. I. Du Pont de Nemours and Company
- Richard A. Baker
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES