Power tong frames
CA 2428554 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
Apparatus for securing a joint between two lengths of tubular. The apparatus comprises a tong arrangement (23) comprising a rotary tong (1) and a back-up tong (11). A frame (20) has a seat (21) for supporting the tong arrangement (23) from beneath, the tong arrangement (23) resting upon the seat (21) such that the tong arrangement (23) can be oriented in use at an angle to the longitudinal axis of the frame (20). Means (32) are provided for securing the tong arrangement (23) to the frame (20) at a chosen orientation.
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 November 19, 2001 and granted April 17, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 19, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 19, 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.