Stock material or miscellaneous articles – Circular sheet or circular blank – Seal – gasket – or packing
Reexamination Certificate
2007-10-09
2010-11-09
Mulcahy, Peter D. (Department: 1796)
Stock material or miscellaneous articles
Circular sheet or circular blank
Seal, gasket, or packing
C428S315500, C524S545000, C526S242000, C526S250000
Reexamination Certificate
active
07829171
ABSTRACT:
Improved expanded PTFE materials and improved gasket materials made therefrom, the gaskets being capable of forming a seal with greater bolt load retention than is possible with existing PTFE gaskets. The expanded PTFE membranes of the invention can be tailored to exhibit a matrix tensile strength in at least one direction of at least 25,000 psi, a matrix tensile strength ratio in two orthogonal directions of between 0.25 and 4, an orientation index of 50° or less, and a density of 2.0 g/cc or less. The improved gaskets exhibit improved mechanical properties such as high bolt load retention, low creep, high tensile strength, low stress to seal and high crystallinity index.
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PCT International Search Report for PCT/US2004/007062.
Bowen Christopher
Dove Kevin Edward
Jones Carl
Minor Raymond B.
Burkhard Dianne
Gore Enterprise Holdings Inc.
Hu Henry
Lewis White Carol A.
Mulcahy Peter D.
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