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Dual surface heaters
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Patent number 5,844,212
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Issue date Dec 1, 1998
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Gas Research Institute
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David M. Dickens
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Pipe scraper
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Patent number 5,600,862
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Issue date Feb 11, 1997
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Gas Research Institute
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Randy J. Bleske
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Dual surface heaters
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Patent number 5,528,020
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Issue date Jun 18, 1996
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Gas Research Institute
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David M. Dickens
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL