Self-draining backflow prevention valves
CA 2030132 A1 · Owner: King, Joseph A. · Inventors: King, Joseph A.; King, Lloyd H. Sr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention comprises an automatic self-draining backflow prevention valve having an internal cylindrical resilient sleeve that expands or contracts in response to water pressure to coact with a two way valve that provides for automatic self-draining of both the water faucet and the backflow prevention valve when the water faucet is shut off.
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 November 16, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 16, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 16, 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.