Method and apparatus for sealing a center valve vacuum filter
CA 2084635 C · Owner: Beloit Technologies, Inc. · Inventors: Bardsley, Donald E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A seal for a rotating center valve vacuum filter drum has a non-flat cross section with an elastomeric core and a chemical resistant sheathing. The seal is installed under tension so that, as wear occurs during operation, positive sealing contact is maintained. The non-flat cross section provides a nesting relationship with the center valve slot and stationary shoe to resist any tendency to wander out of the slot.
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 December 4, 1992 and granted May 26, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 4, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 4, 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.
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.