Ball valve
CA 2045596 C · Owner: Kemp, Willard E. · Inventors: Kemp, Willard E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A ball valve has a ball valve member mounted for floating movement in a valve chamber between an upstream metal seat and a downstream metal seat. Each metal seat fits within a recess and has a body portion of a generally uniform thickness, adjacent an opposed shoulder with a lip about its inner circumference for sealing, against spherical surface of ball valve member at all times. Body portion acts as a, Belleville spring and spaces lip from adjacent shoulder at low fluid pressures. A, bearing portion has an arcuate seat spaced from spherical surface at low fluid pressures, but contacting spherical surface at high fluid pressures. A flexible connector of a, relatively thin uniform …
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 January 10, 1990 and granted August 1, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 10, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 10, 2012.
- 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.