Multi-purpose wellhead apparatus for oil wells
United States Patent 3077931
US Patent References:
/RE24609.html
- - RE24609

Combination casing head and casing support
- - 1863890

Oil well casing head
- - 1988442

Oil well casing head
- - 2009989

Wellhead assembly
- - 2035834


Inventors:
Shaffer, Donald U.
Greenwood, Eugene C.
Publication Date:
02/19/1963
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Assignee:
SHAFFER TOOL WORKS
Primary Class:
166/89.300
Other Classes:
285/123.600
International Classes:
E21B33/04; E21B33/03
US Patent References:
2042745Tubing head
2096565Tubing head
2228555Means for securing casing in a well
2306102Casing head
2417181Oil well pressure control system
2652895Sealing device for well heads
Foreign References:
DE1086643B