Selective downhole operating system and method
CA 2101982 C · Owner: Halliburton Company · Inventors: Manke, Kevin R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A system for controlling a plurality of downhole apparatus comprises a housing inside which a biasing force is provided. An activating force can be received in the housing so that the activating force acts in opposition to the biasing force. The plurality of downhole apparatus are selectively operated in response to different magnitudes of the activating force acting in opposition to the biasing force. The present invention also provides a corresponding method.
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 5, 1993 and granted March 11, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 5, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 5, 2015.
- 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.