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US 12,516,488 B2Granted
Laminous manway cover gasket
AssigneeVsp Tech., Inc.
InventorsDaniel Ferris Matthews Reid, Alfred Fitzgerald Waterland, III, Jeffery William Wilson
Life of this patent
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Abstract
A laminous processed manway cover gasket includes an insert and a plurality of ePTFE layers of membranes wrapping the insert to result in isolation of the insert. In example, the isolation may result from a laminous, thermo-mechanical process that fuses together each ePTFE layer of membrane of the plurality of ePTFE layers of membranes.
Claims7
A composite manway gasket for a manway cover, the gasket comprising:
- a laminous seamless shell composed of at least five of expanded polytetrafluoroethylene membrane layers (ePTFE membrane layers) fused together in a laminous seamless form;
- and
- an insert material isolated in the laminous seamless shell,
- wherein a density of each ePTFE membrane layer of the ePTFE membrane layers has a pre-fusion thickness selected from a range about 0.001 inches to 0.010 inches and a pre-fusion density range of about 0.06 g/cc defined by a minimum density of about 0.47 g/cc and a maximum density of about 0.53 g/cc, and
- wherein the laminous seamless shell has a nominal density selected from a range of about 0.7 g/cc to 1.3 g/cc, based on total mass of the ePTFE membrane layers divided by total shell volume.
2 more elements
Dependencies are inferred from the claim text.