Internal backup ring system
CA 2251307 C · Owner: Thicke, Brian R. · Inventors: Sawa, Mark R.; Anderson, Clifford J.; Thicke, Brian R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An actuation system preferably for mounting between front and rear clamping mechanisms in a pipe clamping apparatus as part of an internal backup ring system. The system includes a guide a cam plate positioned adjacent to the guide and rotatable relative thereto a drive mechanism coupling the guide and the cam plate such that actuation of the drive mechanism causes the cam plate to rotate relative to the guide about an axis of rotation and a power source for driving the drive mechanism. A backup ring assembly having a plurality of backup shoe units may be associated with the cam plate such that rotation of the cam plate relative to the guide plate causes the backup ring assembly to move …
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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 23, 1998 and granted June 3, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 23, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 23, 2020.
- 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.