Bottom rotation shaft actuator
CA 2278526 C · Owner: Testers, Inc. · Inventors: Hailey, Charles D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An actuator for effecting bottom hole rotation consisting of an upper wash pipe (10) having a spiral groove mandrel (34) that is in operative association with a ball clutch assembly (48) that is secured to the upper wash pipe (10). The weight placed on the actuator at the wash pipe connection is effective to drive the mandrel (34) and ball clutch assembly (48) through a given amount of rotation, e.g. five rotations per actuation can be applied to a selected working tool.
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 January 30, 1998 and granted April 22, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 30, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 30, 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.