Flow control weir valve
CA 2204635 C · Owner: Sargent, Ronald J. · Inventors: Mclaughlin, Shawn M.; Sargent, Ronald J.; Stoltz, Gerhardus J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A flow control weir valve and method of operating the valve is disclosed. The valve has an inlet (12), an outlet (14) a bypass inlet (16), a pivoting cover (20) and a mechanism for controlling the cover in order to provide a relief flow through the valve. The cover is continuously forced to a first closed , position by one or more resilient springs (21) or other flexible force producing mechanisms. When fluid flows within the valve the closing force , generated by the springs may be overcome by the low pressure generated within the valve, which thus allows the ambient environment to force the cover at least partially open once the fluid flow rate passes a threshold value. A step (40) …
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 October 27, 1995 and granted January 1, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 27, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 27, 2017.
- 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.