Bearing and seal percolator for a centrifugal pump
CA 2198410 C · Owner: Thamarus, Francis W. · Inventors: Thamarus, Francis W.; Buse, Frederic W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A percolator system for providing fluid flow to bearings and seals supporting a shaft, on which is mounted an impeller having pumping vanes, disposed within a housing of a centrifugal pump, during intermittent dry running periods the pump having a, vertical upwardly directed discharge nozzle includes a chamber, having a lower end attached to the discharge nozzle and an upper end attached to a discharge pipe, the chamber having an inside diameter greater than an outside diameter of the discharge nozzle, and the chamber further having an internal percolator pipe at least equal in diameter to the discharge nozzle and extending from the nozzle to a height less than the height of the chamber …
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 February 25, 1997 and granted April 22, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 25, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 25, 2019.
- 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.