Title:
Drill pipe float valve
United States Patent 2771091


Inventors:
Baker, Reuben C.
Ragan, Thomas M.
Application Number:
US41199154A
Publication Date:
11/20/1956
Filing Date:
02/23/1954
Assignee:
BAKER OIL TOOLS INC
Primary Class:
Other Classes:
137/454.2, 137/515, 137/516.29, 251/357
International Classes:
E21B21/10
View Patent Images:
US Patent References:
2744727Drill pipe float valve1956-05-08
2329576Slush pump valve1943-09-14
2192670Valve1940-03-05
2185173Back pressure valve1940-01-02
2148850Mud pump valve1939-02-28
2011812Valve mechanism1935-08-20
Foreign References:
FR591449A1925-07-03
GB302848A1928-12-27