Downhole apparatus

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – Fluid head on tool shaft having lateral port and axial...

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C175S215000, C166S319000

Reexamination Certificate

active

07357198

ABSTRACT:
The invention relates to apparatus for use in wellbores and particularly, but not exclusively, to circulating subs used during downhole drilling operations. The apparatus includes a control groove and a pin received within the control groove for determining whether or not a longitudinal movement of a piston in a given direction relative to the apparatus body will move the apparatus between open and closed configurations. The apparatus further includes a control member located between and movable relative to the body and the piston. The control groove is defined in one of the piston and control member, and the pin is provided on the other of the piston and control member. Means are also provided for constraining movement of the piston relative to the body to longitudinal movement only. The invention thus provides an apparatus which has improved reliability in moving between open and closed configurations.

REFERENCES:
patent: 4276931 (1981-07-01), Murray
patent: 6289999 (2001-09-01), Dewey et al.
patent: 6401822 (2002-06-01), Baugh
patent: 2 377 234 (2003-01-01), None

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Downhole apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Downhole apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Downhole apparatus will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2788378

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.