Improved gasket for an aerosol valve stem
CA 2371314 A1 · Owner: Precision Valve Corporation · Inventors: Hafner, Hans
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The improved valve stem gasket of this invention comprises a flat-shaped gasket (50) with a central aperture (52) wherein the durometer of the gasket varies from a relatively low hardness value in the inner portion (A) of the gasket extending radially outward from the central aperture to a relatively higher hardness value at the radially outer portion (C) of the gasket whereat the gasket will be contacted by the upper wall portion (36) of the valve housing (26). In a preferred form of the gasket the variation in durometer , value will be gradually varied from the inner portion of the gasket to the radially outer portion of the gasket.
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 April 27, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 27, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 27, 2022.
- 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.