Roy D. Hegedus

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Millvale, PA, US

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Patents Grantslast 30 patents

Information Patent Grant
Silica-rich porous substrates with reduced tendencies for breaking...
- Patent number 4,933,307
- Issue date Jun 12, 1990
- PPG Industries, Inc.
- William P. Marshall
- C03 - GLASS MINERAL OR SLAG WOOL