Apparatus and method
CA 2397962 A1 · Owner: Robichaux, Dicky · Inventors: Robichaux, Dicky
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus for inserting or removing a string of tubular from a borehole includes upper and lower closed head power tongs to make up/break out connections with the lower tong as rotary back-up. It also includes a continuous circulation system to keep fluid circulating during tripping operations and a safety slip to prevent tubulars slipping therein comprising two arrangements of grips which are coupled to one another.
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 February 26, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 26, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 26, 2023.
- 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.