William I. Frey

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Curtisville, PA, US

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Patents Grantslast 30 patents

Information Patent Grant
Release molds for laminating bilayer safety glass
- Patent number 4,277,299
- Issue date Jul 7, 1981
- PPG Industries, Inc.
- Joseph Cherenko
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Method for developing a release surface on a glass mold
- Patent number 4,274,856
- Issue date Jun 23, 1981
- PPG Industries, Inc.
- William I. Frey
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Polyurethane laminates
- Patent number 3,971,864
- Issue date Jul 27, 1976
- PPG Industries, Inc.
- William R. Beestrice
- B32 - LAYERED PRODUCTS