Automatic variable-demand flow regulator
CA 2217657 A1 · Owner: Leon, Stephen · Inventors: Leon, Stephen; Leon, Eric
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A variable-demand flow regulator (10) regulates water flow into a building based on variable water supply and variable demand pressures. When demand increases downstream of the flow regulator the water pressure decreases on , the downstream side of a piston valve (200) and a piston (201) of the piston valve (201) moves in the downstream direction. This results in an increased number of access holes (320) being exposed to water flow thus allowing a , higher flow of water when demand increases. An adjustable bleeder valve (500) controls the flow characteristics of the regulator (10) by affecting movement of the piston (201).
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 February 19, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 19, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 19, 2019.
- 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.