Stabilising concentrated hydrogen peroxide solutions
CA 2021264 C · Owner: Feasey, Neil David · Inventors: Feasey, Neil David; Morris, Gareth Wilmot
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Concentrated solutions of hydrogen peroxide tend to decompose on storage, thereby losing their effectiveness amongst other reasons by virtue of interaction with contaminating transition metals. Peroxygen compounds are stabilised by contact with a stabilising amount of compound of general formula: (See formula I), in which X represents a methylene phosphonic acid group of formula -CH2-(-PO3H2) or salt thereof, R represents a tetra methylene diradical, optionally alkyl-substituted that completes a cyclo-aliphatic ring and thereby establishes the two NX2 groups in a substantially fixed configuration and Y represents a hydrogen or lower alkyl group. Preferably, the solutions contain …
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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 July 16, 1990 and granted August 15, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 16, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 16, 2012.
- 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.