Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Reexamination Certificate
2004-10-13
2008-12-09
Berman, Susan W (Department: 1796)
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
C264S331170, C264S346000, C522S161000
Reexamination Certificate
active
07462318
ABSTRACT:
A radiation crosslinked (50 kGy), pressure-treated UHMWPE material has been developed by applying compressive force on a crosslinked polymer in a direction orthogonal to an axial direction. The deformed material is then cooled while held in a deformed state. The resulting material is anisotropic, with enhanced strength oriented along the axial direction. The directionally engineered material is oxidatively stable even after four weeks of accelerated aging in a pressure vessel containing five atmospheres of oxygen (ASTM F2003). Because of its oxidative stability, the deformation processed material is a suitable candidate for air-permeable packaging and gas sterilization, which has thus far been reserved for remelted highly crosslinked UHMWPEs.
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Freedman Jordan H.
Gunter James E.
Hawkins H. Gene
Salyer Brian D.
Schroeder David W.
Berman Susan W
Biomet Manufacturing Corp.
Harness & Dickey & Pierce P.L.C.
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