Dual density sanitary pipe gasket
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 26, 1999
Issued Date -
N/A
app pub date -
May 5, 1997
filing date -
Aug 17, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A sanitary-pipe gasket includes an annular disk portion of predetermined thickness, and a projecting portion which is provided concentrically with the annular disk portion on each of the upper and lower surfaces of the annular disk portion. The annular disk portion and the projecting portion of the sanitary-pipe gasket are integrally formed of porous PTFE such that the density of the annular portion ranges from 1.0 to 1.9 g/cm.sup.3 and the density of the projecting portion ranges from 0.3 to 1.8 g/cm.sup.3. The gasket is produced by disposing a porous PTFE sheet of 0.3 to 1.4 g/cm.sup.3 density and 1 to 10 mm thickness in a mold, and applying pressure perpendicular to the sheet at room temperature or with heating. The density of the gasket adjacent the planar surfaces and a peripheral edge surface is substantially higher than the density further inward of these surfaces, and the density adjacent the peripheral edge surface is sufficient to seal the peripheral edge surface against radial flow past the gasket when installed between a pair of flanges.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully