Slip assembly
CA 2001606 A1 · Owner: Cox, Don C. · Inventors: Cox, Don C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An hydraulically operated slip assembly used to grip pipe being run into or pulled from a well has upper and lower plates, each having a passage for pipe. Wedges carrying unique slip systems are positioned around the passages between the plates and are slidably mounted for guided radial movement inwardly to grip pipe and outwardly to ungrip pipe as moved by an hydraulic cylinder pivotally mounted aside on the lower plate. The unique slip systems automatically increase grip on pipe on up or down movement of gripped pipe caused by up or down loads on the pipe. By operating the slips through pawls and cam plates such automatic increase of grip is triggered by pipe movements in excess of about …
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 October 26, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 26, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 26, 2011.
- 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.