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Title:
Equalizing standing valve with hold-down
United States Patent 2994280
Inventors:
Daffin, Douglas E.
Publication Date:
08/01/1961
Export Citation:
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Assignee:
CAMCO INC
Primary Class:
166/133
Other Classes:
137/68.17, 137/454.4, 166/217, 166/322, 166/324, 166/325, 285/2
International Classes:
E21B34/14; E21B34/00
View Patent Images:
Download PDF 2994280         PDF help
US Patent References:
2944605Means for carrying out a removable flow tube program
2901045Locking means for well tools
2871947Locking devices for well tools
2854929Oil well standing valve
2839144Well flow device
2816613Well tubing stop
2806539Well tester
2778433Well tools
2392244Well tool
2131299Pumping apparatus
1956112Pump
0927236N/A
0172227N/A
0061447N/A
Foreign References:
GB331604A






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