Vented port-cap for fire hydrant
CA 2517744 C · Owner: Holland, Darryll Arthur Douglas · Inventors: Holland, Darryll Arthur Douglas; Montgomery, Sean Kellie
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The vented port-cap includes a check-valve which admits air into the barrel of the hydrant when the pressure inside is lower than the pressure outside. After an inspection of the hydrant the hydrant can be left to drain by itself even though the port-cap has been replaced and tightened.
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 August 31, 2005 and granted May 28, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 31, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.