John K. Groetzinger

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Cumberland, MD, US

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Patents Grantslast 30 patents

Information Patent Grant
Glass melter exhaust duct cleaning method and apparatus
- Patent number 4,969,942
- Issue date Nov 13, 1990
- PPG Industries, Inc.
- Ronald L. Schwenninger
- C03 - GLASS MINERAL OR SLAG WOOL
Information Patent Grant
Air cooled rotary kiln collar
- Patent number 4,836,775
- Issue date Jun 6, 1989
- PPG Industries, Inc.
- Robert B. Heithoff
- F27 - FURNACES KILNS OVENS RETORTS
Information Patent Grant
Method of preheating pulverulent batch material
- Patent number 4,707,175
- Issue date Nov 17, 1987
- PPG Industries, Inc.
- Robert B. Heithoff
- F27 - FURNACES KILNS OVENS RETORTS
Information Patent Grant
Method and apparatus for feeding an ablation liquefaction process
- Patent number 4,529,428
- Issue date Jul 16, 1985
- PPG Industries, Inc.
- John K. Groetzinger
- C03 - GLASS MINERAL OR SLAG WOOL
Information Patent Grant
Transition between batch preheating and liquefying stages apparatus
- Patent number 4,496,387
- Issue date Jan 29, 1985
- PPG Industries, Inc.
- Robert B. Heithoff
- C03 - GLASS MINERAL OR SLAG WOOL