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John D. Metcalf
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Akron, OH, US
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last 30 patents
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Patent Grant
Drop door control for internal mixer
Patent number
5,492,403
Issue date
Feb 20, 1996
The Goodyear Tire & Rubber Company
John D. Metcalf
B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL