Screw for Composite/Plastic Materials
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United States of America Patent
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app pub date -
Oct 18, 2013
filing date -
Oct 11, 2007
priority date (Note) -
Abandoned
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Abstract
A fastener for composite or plastic material having a dense composition employs a head which has a socket and a recessed underside and a lower rim. In one embodiment, the shank has an upper portion with an enlarged diameter and a left hand thread while the lower portion has a tri-lobed configuration and is traversed by a right hand thread. The right hand thread may have a plurality of notches which, in one embodiment, are arranged in a spiral array.
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