Rotary valve
CA 2129776 C · Owner: Bray International, Inc. · Inventors: Dernovsek, John R.; Gent, David W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is disclosed a butterfly valve having a body connectable in a flowline and a seat which lines its inner side and a disc which has stem portions at its opposite ends closely received within openings in the seat and body to permit the disc to be rotated between opened and closed positions. A ring which is restrained from movement with one of the disc and seat in a direction transverse to the stem portions substantially fills a groove in the other of the disc and seat which surrounds each stem portions so as to seal between the seat disc and such stem portion.
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 August 9, 1994 and granted October 17, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 9, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 9, 2016.
- 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.