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CLAPPER VALVE WITH CHANGING BIAS
US 3,478,778 A
Filed
: 05/25/1967
Issued
: 11/18/1969
Est. Priority Date
: 05/25/1967
Status: Expired due to Term
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18 Citations
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Current Assignee
Curtiss Alan Clarkson
,
Hood Roger Williams
Original Assignee
Curtiss Alan Clarkson
,
Hood Roger Williams
Inventors
CURTISS ALAN CLARKSON
,
HOOD ROGER WILLIAMS
Application Number
US04/641,337
Time in Patent Office
908 Days
Field of Search
US Class Current
137/527.4
CPC Class Codes
E03C 1/106
using two or more check valves
E03C 1/108
having an aerating valve
F16K 15/00
Check valves valves special...
F16K 15/033
spring-loaded
F16K 15/035
with a plurality of valve m...
F16K 2200/204
in series
Y10T 137/7901
Valve head movably connecte...
Y10T 137/7906
Cam means for adjusting and...
Y10T 137/7907
Varying effective lever arm
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