Wells – Above ground apparatus – Well caps or casing heads
Reexamination Certificate
2008-05-21
2010-06-01
Thompson, Kenneth (Department: 3672)
Wells
Above ground apparatus
Well caps or casing heads
C166S075140, C166S096100
Reexamination Certificate
active
07726393
ABSTRACT:
A wellhead assembly is provided including a casing and a tubular member mounted over the casing. A flange extends from the tubular member. A generally elongated annular member is provided in the tubular member. The generally elongated annular member has a first end portion above the tubular member and second end portion below the first end portion. A hanger may be suspended within the tubular member. In such case, a seal may be formed between the elongate annular member and the hanger.
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Duhn Oil Tool, Inc.,Duhn
Duhn Rex E.
Meek Robert K.
Christie Parker & Hale LLP
Duhn Oil Tool, Inc.
Thompson Kenneth
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