Seal assembly for a shaft comprising a stuffing box
CA 2069020 C · Owner: Tor Birger Krageboen · Inventors: Erdal, Jan Helge
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A seal assembly for a shaft comprising a stuffing box having an inner circular cylindrical wall surface for attachment on or in a wall having an opening for passage of a shaft therethrough. Said seal assembly having at least one first annular sealing lip of elastic material e.g. rubber or, similar material, secured at each end section of the stuffing box and which encloses and bears resiliently against the shaft, forming acute angles therewith, said first lips defining between them an annular chamber in the stuffing box for at least one annular elastic sealing member disposed between the shaft and the inner circular cylindrical wall surface of the stuffing box. Said sealing member is …
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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 20, 1992 and granted September 30, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 20, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 20, 2014.
- 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.