Polish rod protector sleeve
CA 2246196 C · Owner: Cahill, Drew E. · Inventors: Cahill, Drew E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus and method are provided for protecting a reciprocating polish rod from suffering circumferential scoring when it is rotated by a rodrotator, while misaligned and in contact with the carrier bar of a pump jack. A cylindrical, sleeve is inserted through the bore of the carrier bar and any additional stacked, components supported thereon. An upset at the top of the sleeve retains it within, the bore of the carrier bar and any stacked components. The bottom end of the sleeve extends substantially to the bottom of the carrier bar. The polish rod is, installed through the bore in the sleeve and can slide and rotate therein. The polish rod is suspended from the carrier structure 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 September 1, 1998 and granted June 18, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 1, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 1, 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.