Rotary seal and/or bearing
CA 2233486 C · Owner: A. W. Chesterton Co. · Inventors: Ramsay, Thomas W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
For an impeller pump, the seal/bearing unit has two rotor-stator pairs of tapered sleeves arranged back-to-back. The sleeves have a spiral groove and , convey barrier-liquid from an entry-mouth in an entry-chamber to an exit-mouth in an exit-chamber. Having two sleeves gives the units mechanical stability trust support capability, and resistance to vibrations and other abuses. The tapered sleeves may be arranged wide-narrow-wide or narrow-wide-narrow. The , sleeves may be mounted for sliding in the housing and on the shaft or may be , fixed to the housing or shaft.
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 October 2, 1996 and granted June 17, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 2, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 2, 2018.
- 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.