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Title:
Equalizing standing valve with hold-down
United States Patent 2994280
Inventors:
Daffin, Douglas E.
Application Number:
US72405158A
Publication Date:
08/01/1961
Filing Date:
03/26/1958
Assignee:
CAMCO INC
Primary Class:
Other Classes:
137/68.17, 137/454.4, 166/217, 166/322, 166/324, 166/325, 285/2
International Classes:
E21B34/14
View Patent Images:
US Patent References:
2944605Means for carrying out a removable flow tube program1960-07-12
2901045Locking means for well tools1959-08-25
2871947Locking devices for well tools1959-02-03
2854929Oil well standing valve1958-10-07
2839144Well flow device1958-06-17
2816613Well tubing stop1957-12-17
2806539Well tester1957-09-17
2778433Well tools1957-01-22
2392244Well tool1946-01-01
2131299Pumping apparatus1938-09-27
1956112Pump1934-04-24
0927236N/A1909-07-06
0172227N/A1876-01-11
0061447N/A1867-01-22
Foreign References:
GB331604A1930-07-10