Rod centralizer fishing tool
CA 2227125 A1 · Owner: Scott, Robert Lindsay · Inventors: Scott, Robert Lindsay
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The pump jack at a producing petroleum well actuates a steel rod which extends down the length of the, well tubing to a bottom hole pump. There are two types of rod; (1) noncontinuous round rod which is, assembled in 32 foot lengths and (2) continuous tapered elliptical or round rod, which is extended and, recovered from a reel. This application is for a tool which will service the non-continuous round rod, only. When round rod is installed in a well tubing plastic "centralizers" are , heat-bonded to the shaft of the rod at specified intervals. These centralizers serve two purposes; (1) they act as a spacer between, the rod shaft and the well tubing keeping the rod centred and …
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 27, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 27, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 27, 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.