Donald G. Zook

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Metamora, IL, US

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Patents Grantslast 30 patents

Information Patent Grant
Core portion for a tube tire
- Patent number 4,177,027
- Issue date Dec 4, 1979
- Caterpillar Tractor Co.
- Charles E. Grawey
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Method of making a portion of an hollow, annular, sand-core
- Patent number 3,998,918
- Issue date Dec 21, 1976
- Caterpillar Tractor Co.
- Charles E. Grawey
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Air cushion workpiece carrier
- Patent number 3,987,990
- Issue date Oct 26, 1976
- Caterpillar Tractor Co.
- Keith E. Koch
- B66 - HOISTING LIFTING HAULING