Case cementing method and system
CA 2128337 C · Owner: Jones, Richard Rodney · Inventors: Jones, Richard Rodney; Taylor, Kenneth R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A system for cementing well casing (16) in a bore hole (12) utilizes only top (22) and, bottom (20) cementing plugs. The well casing (16) has on its lower end an inwardly extending, lip (18) to engage a latch (30) on the lower portion of the bottom cementing plug (20). The, bottom cementing plug (20) has a through passage (26) that is covered on the top by a diaph-, ragm (32) and on the bottom by another diaphragm (34).
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 17, 1993 and granted August 21, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 17, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 17, 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.