Pressure relief device and method
CA 2091130 C · Owner: Lyons, Jay · Inventors: Smith, Jerry; Lyons, Jay; Engstrom, Karl
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a pressure relief device for aerosol containers that may be subject to high internal pressures. The pressure relief device is a small plug formed of a rubber material. The plug has first and second bores extending inwardly from each end and defining between them a thin integral diaphragm separating the bores. A groove extends circumferentially around the device, and one end of the device is tapered so that it can be forced into a hole in the bottom of an aerosol container. The area and thickness of the diaphragm can be varied to control the pressure at which the diaphragm will rupture to relieve excess pressures in the container. The rupturable diaphragm is protected …
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 March 5, 1993 and granted January 5, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 5, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 5, 2015.
- 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.