Well clean out tool
CA 2016311 C · Owner: Ferguson, Fred S. · Inventors: Perry, Lonnie K.; Ferguson, Fred S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A well clean out tool installed in a drill string is operable to pump sand and debris from the well bore. A pump portion includes an elongate pump barrel having apertures extending through its side wall at the upper end which is attached at its bottom end to one or more the debris-receiving and trapping subs and enclosed at its upper end by a top cap having a hexagonal opening. A hexagonal pump mandrel extends through the top cap and is connected to the bottom of the drill string by a top sub having apertures through its side wall whereby the pump barrel may be rotated with the drill string. A swab assembly contained within the pump barrel and connected to the bottom end of the pump mandrel …
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 May 8, 1990 and granted October 25, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 8, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 8, 2012.
- 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.