A scented air freshening device and method for making the same
CA 2070936 C · Owner: Baxter, James T. · Inventors: Vick, Douglas M.; Baxter, James T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of producing an air freshening device capable of attachment to an existing air filter comprising the steps of forming a mixture of effective amounts of a fragrant material, a polymer and a volatile solvent for the fragrant material and the polymer, applying the mixture to a substrate through which air may pass, allowing the solvent to evaporate to leave a fragrant residue on the substrate and, attaching the substrate to an existing air filter device capable of attachment to an existing air filter, comprising a residue of effective amounts of a fragrant material and polymer applied to a piece of foam rubber and means for attaching said device to the existing air filter is also …
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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 June 10, 1992 and granted May 25, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 10, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 10, 2014.
- 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.