Pipes and tubular conduits – Distinct layers – With intermediate insulation layer
Reexamination Certificate
2003-07-18
2010-12-21
Hook, James F (Department: 3754)
Pipes and tubular conduits
Distinct layers
With intermediate insulation layer
C138S112000, C138S114000
Reexamination Certificate
active
07854240
ABSTRACT:
The foam tube for pipe insulations has an external surface and an internal surface. The internal surface is provided with an adhesively bonded layer of fibers. The fibers are a material having a melt temperature that is higher than that of the polymeric foam. The fibers are adhesively bonded to the internal surface such as to stand up from the internal surface. The fibers are substantially uniformly distributed over the internal surface providing a surface coverage of 2 to 20 percent. Further, the fibers have a linear density of 0.5 to 25 dtex and a length of 0.2 to 5 mm. With this fiber layer the polymeric foam tube has an improved thermal resistance and thermal conductivity.
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Davis Stephen C.
Meller Mika
Princell Charles
Weibel Juerg
White Scott A.
Armacell Enterprise GmbH
Hook James F
Rothwell Figg Ernst & Manbeck P.C.
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