Cassette seal
CA 2074697 C · Owner: Carl Freudenberg · Inventors: Johnston, David Ernest
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cassette seal for sealing the gap between a bore wall and a shaft includes an inner ring fastened to the shaft and having a radially outwardly open groove, an outer ring fastened in the bore and having a flange type radial projection extending into the groove and a sealing lip of polymeric material fastened to the radial projection in the region of the inner circumference. At least the inner ring 19 made of plastically deformable sheet metal. The inner ring is one single part and is provided at both axial ends with radially outwardly directed annular projections made by plastic deformation. The groove is defined in axial direction by mutually opposed axial surfaces of the annular …
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 27, 1992 and granted March 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 27, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 27, 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.