Well tool
CA 2017997 C · Owner: Sable, Donald E. · Inventors: Sable, Donald E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A centralizes for the rods of a pump rod string for holding the rods in central longitudinal alignment with and in the tubing. When installed on a rod there is an upper pair of ribs extending outwardly in radially opposite directions from the longitudinal direction of the rod and a lower pair of ribs extending outwardly in radially opposite directions from the longitudinal direction of the rod and the upper and lower pairs extending in generally orthogonal directions to each other. Preferrably there is an intermediate portion between the ribs of smaller external diameter thereof.
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 31, 1990 and granted March 13, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 31, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 31, 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.