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William D. Stephens
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Pinellas Park, FL, US
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last 30 patents
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Patent Grant
Digestion products of polyalkylene terephthalate polymers and polyc...
Patent number
4,873,268
Issue date
Oct 10, 1989
Sloss Industries Corporation
Richard K. Hallmark
C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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Patent Grant
Digestion products of polyalkylene terephthalate polymers and polyc...
Patent number
4,539,341
Issue date
Sep 3, 1985
Jim Walter Resources, Inc.
Richard K. Hallmark
B32 - LAYERED PRODUCTS