Title:
Side-plug hydraulic cellar gate
United States Patent 2592197


Inventors:
Schweitzer Jr., Frank J.
Application Number:
US78236347A
Publication Date:
04/08/1952
Filing Date:
10/27/1947
Assignee:
Schweitzer Jr., Frank J.
Primary Class:
Other Classes:
137/637, 251/324
International Classes:
E21B33/06
View Patent Images:
US Patent References:
2282363Blowout preventer1942-05-12
2154955Well casing control valve1939-04-18
2035319Blowout preventer1936-03-24
1858927Method of making valves1932-05-17
1565650Check valve1925-12-15