Multi-purpose float equipment and method
CA 2403174 C · Owner: Allamon, Jerry P. · Inventors: Musselwhite, Jeffrey D.; Allamon, Jerry P.; Miller, Jack E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A float shoe/collar apparatus (14) and method is disclosed for multi-purpose use in running a tubular string (11) such as a casing string or liner into a wellbore and for optimizing cementing operations. In one presently preferred embodiment, the present invention permits auto filling of the tubular string (11) as the string (11) is lowered into the wellbore. If desired circulation , can be effected through down jets (30) for washing the wellbore as necessary. After the tubular string (11) is positioned the down jets (30) can be blocked , off and up jets (33) opened to thereby direct cement upwardly to optimize cement placement. Check valves (31) can also be activated in accord with …
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 March 12, 2001 and granted February 21, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 12, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 12, 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.