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Thread-forming screw
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Patent number 5,242,253
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Issue date Sep 7, 1993
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Semblex Corporation
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James G. Fulmer
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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Self-threading polymeric fastener
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Issue date Apr 14, 1987
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Harvey Hubbell Incorporated
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Albert J. Gartland
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3350975
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Patent number 3,350,975
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Issue date Nov 7, 1967
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3306153
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Patent number 3,306,153
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Issue date Feb 28, 1967
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL