Method and apparatus for connecting tubulars using a top drive
CA 2799485 C · Owner: Weatherford Technology Holdings, Llc · Inventors: Pietras, Bernd-Georg
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for facilitating the connection of tubulars said apparatus comprising a winch (15) at least one wire line (4, 5) and a device (2) for gripping a tubular (3) the arrangement being such that, in use the winch (15) can be used to winch said at least one wire (4 5) and said device (2) to position a tubular (3) below said top drive.
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 August 16, 1999 and granted October 7, 2014. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 16, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 16, 2021.
- 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.