Integral tubing head and rotator
CA 2210239 C · Owner: Campbell, David W. · Inventors: Bland, Linden H.; Campbell, David W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is a tubing head for accommodating a rotator. The rotator includes a drive gear and a swivel tubing hanger which engages an internal surface of the tubing head and comprises a driven gear for engaging the drive gear. The tubing head defines a gear housing for the drive gear so that the drive gear may releasably engage the driven gear. The internal surface gear housing and drive and driven gears are configured such that when the drive gear is in the gear housing the tubing hanger, engages the internal surface and the drive and driven gears are engaged the tubing, hanger may be removed from the tubing head by pulling it through the upper end without first disengaging the 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 July 11, 1997 and granted November 17, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 11, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 11, 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.