Expired Canadian patentCanada
Tandem mounted face seals
CA 2021157 C · Owner: Korenblit, Izya · Inventors: Korenblit, Izya
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Tandem mounted face seals for use in centrifugal pumps with dynamic seals. One face seal has a flexible lip and the other face seal has a non-flexible lip to ensure sealing at high static or dynamic pressures.
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 July 13, 1990 and granted October 21, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 13, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 13, 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.
FiledJuly 13, 1990
GrantedOctober 21, 1997
Term endedJuly 13, 2010
Patent numberCA 2021157 C
Classification (IPC)F04D29/10 +1 more
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.