Nozzle assembly for preventing back-flow
CA 2097700 C · Owner: Dunne, Stephen Terence · Inventors: Weston, Terence Edward; Dunne, Stephen Terence
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present inven-, tion relates to a device for controlling flow which, comprises: a) a housing member (102) having an, internal chamber through which fluid is adapted to, flow; and b) a static infill member (116) located, within the chamber and forming a passageway, (120, 122, 128) for the flow of fluid between the inter-, nal wall of the chamber and the external wall of, the support chamber which passageway is di-, mensioned so as to restrict the back flow of fluid, therethrough at an ambient pressure differential. Preferably the internal, chamber and the infill, member are circular in cross-section and the pas-, sageway is provided by the annular gap between the opposing axial walls of …
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 December 4, 1991 and granted August 19, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 4, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 4, 2013.
- 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.