Pump bearing system
CA 2040869 C · Owner: Ingersoll-Rand Company · Inventors: Wotring, Timothy L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A centrifugal pump of the type specially adapted to be used as a boiler feed pump and including a bearing system at the driven end of the pump comprising a bearing chamber housing a flexible bearing supporting the pump shaft and being cooled by the fluid that is being pumped which is fed to the bearing through passages in the pump casing. The pump further includes controlled leakage seals located at each end of the bearing and adapted to leak the cooling fluid at controlled rates into both the chamber housing the pump impeller and a fluid collection chamber. The leakage into the fluid collection chamber is withdrawn and reused in the usual manner. The pump shaft engages additional seals …
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 April 19, 1991 and granted December 6, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 19, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 19, 2013.
- 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.