Dual component flap
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Oct 18, 1994
Grant Date -
N/A
app pub date -
Oct 13, 1993
filing date -
Oct 13, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A flap valve apparatus and an improved flap valve element which uses integrally bonded layers comprising a first soft flexible layer of an elastomer and a second layer of a rigid plastics material. The method of forming the flap valve element by a two component extrusion process is also disclosed.
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