Water conserving toilet flush valve
CA 2205786 C · Owner: Huang, Jane Rong · Inventors: Huang, Jane Rong
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A ball valve member for use in a flush toilet is adjustable to conserve water by varying the amount of water consumed during each flush of the toilet. The ball valve member allows water consumption of a standard flush toilet to be accurately and steplessly varied between about 4 liters and the entire contents of the toilet's tank. The ball valve member has an internal chamber having an air bleed hole at its upper end and a water inlet at its lower end. The water inlet snaps into place at a lower end of the ball valve member and has a inner piece with a D-shaped opening. A cap, also having a D-shaped opening is, rotatably affixed to the inner piece. The size of the water inlet can be varied …
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 May 21, 1997 and granted August 8, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 21, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 21, 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.