Automatic self energizing stop collar
CA 2258950 A1 · Owner: Frank'S International, Inc. · Inventors: Hawkins, Samuel P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for engagement of cylindrical member (7) about the outside diameter, so that downhole tools may be positioned longitudinally along said cylindrical member. A generally cylindrical outer ring (1) is detachably engaged with a generally cylindrical inner ring (2). Once the inner ring (2) is detached from the outer ring (1) it is automatically present into position by a spring clamping force exerted between the pipe (7) and inner ring. Relative axial motion of the outer ring (1) with respect to the inner ring (2) automatically energizes the inner ring inward providing the high clamping force required to set the self energizing stop collar in its final position.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed June 20, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 20, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 20, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.