Valve assembly
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 16, 1990
Grant Date -
N/A
app pub date -
Sep 7, 1988
filing date -
Sep 7, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A plumbing arrangement is described for a toilet pan connected to a waste disposal pipe. The waste pipe has an extension extending a short height above the flood level of the water trap. The upper end of the extension is closed off by a two way differential valve opening to the atmosphere. A cover is provided to permit the air flow to and from the valve but still to prevent the ingress of leaves or dirt which could have a detrimental effect upon the working of the valve. A number of embodiments of valve means are also described.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
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