Cassette seal
CA 2074446 C · Owner: Carl Freudenberg · Inventors: Schmitt, Wolfgang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cassette seal for a rotatable shaft includes an outer ring and an inner ring of opposite, angular profile. The rings together define an annular chamber with an assumed concentrical axis. The outer ring is provided with at least one sealing lip for resting against the inner ring which includes a radial flange. The outer ring and the flange define a gap therebetween which connects a space to be sealed with the annular chamber. On the side directed away from the flange the gap, widens into circumferentially evenly distributed cut-out segments of the outer sing. The cut-out segments provide channels which connect the annular chamber with the space to be sealed. The channels are defined in …
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 23, 1992 and granted July 21, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 23, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 23, 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.