Appeal No. 2001-1041 Page 5
Application No. 09/219,475
elements in a method of controlling actuation of a rotatable
blowout preventer for use in a hydrocarbon recovery
operation.
In the present reissue application, the appellants seek to
amend patent claims 1 and 16 to read as follows with additions
underlined and deletions bracketed:
1. A rotatable blowout preventer for [use in a hydrocarbon
recovery operation] sealing pressure in a well including a
tubular member passing through the blowout preventer, the
rotatable blowout preventer assembly comprising:
a stationary outer housing defining a bore therein for
receiving the tubular member, the outer housing have a
central axis generally concentric with an axis of the
tubular member, and the outer housing including a fluid
[closing] input port and a fluid output port therein;
an inner housing rotatable within the outer housing
[and having an inner curved surface thereon substantially
defined by a portion of a sphere having a center
substantially adjacent the central axis of the bore];
an annular sealing assembly supported within the inner
housing for sealed engagement with the tubular member, [a
sealing assembly including a plurality of rigid elements
circumferentially arranged about the bore of the outer
housing, each rigid element having an outer surface for
sliding engagement with the inner curved surface of the
inner housing, and] the sealing assembly including a
resilient member for sealed engagement with the tubular
member;
[a rotatable piston axially movable within the outer
housing in response to pressurized fluid in the fluid
closing port for causing both axial and radial movement of
the annular sealing assembly;]
a lower rotary seal [between the piston and a lower
portion of the stationary outer housing] for sealing
pressurized fluid within the stationary outer housing from a
lower end of the bore in the outer housing;
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