Pipes and tubular conduits – Distinct layers – Coated
Reexamination Certificate
2005-11-01
2005-11-01
Hook, James (Department: 3754)
Pipes and tubular conduits
Distinct layers
Coated
C138S138000, C138S143000, C138S127000, C138S153000, C428S036910, C428S920000, C428S921000, C169S054000
Reexamination Certificate
active
06959736
ABSTRACT:
A multilayer pipe which comprises at least an inner layer and an outer layer. The inner layer is made of extrudable plastic, such as polyethylene PE, cross-linked polyethylene PEX or polypropylene PP. The outer layer forms a fire-protecting layer and the matrix plastic of the outer layer is also made of extrudable plastic. A foaming agent, which does not react during the manufacture of the pipe, is mixed with the matrix. Further, the outer layer contains at least one additive in such a manner that the outer layer has a pipe-reinforcing component and a fire-retardant component. Most preferably, at least the outer layer is extruded by an extruder having a screw length ratio of less than 10 to its biggest diameter.
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Fish & Richardson P.C.
Hook James
Uponor Innovation AB
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