Sealed chambers
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United States of America Patent
Stats
-
Jan 31, 1989
Grant Date -
N/A
app pub date -
Nov 10, 1987
filing date -
Nov 20, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to chambers which are sealed against ingress of water and are provided with an element through which air may permeate to equalize pressures of air inside and outside the chamber. The element is of a foamed silicone and has a cellular fine pored layer of predominantly open cells having a skin to be contacted by air outside the chamber. Examples of chambers described and claimed are a vehicle horn and a vehicle headlight.
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