Soda ash peroxygen carrier
CA 2000100 C · Owner: Fmc Corporation · Inventors: Hills, William Avery; Pfeffer, Henry Albert Iii
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel composition of matter is claimed comprising particles which appear to comprise sodium carbonate, sodium percarbonate (also called sodium carbonate peroxide or sodium carbonate perhydrate) and a stabilizer for the compound, preferably a diphosphonic acid, the sodium carbonate being present in sufficient quantity to form sodium carbonate monohydrate by reacting with the available water in the composition.
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 October 3, 1989 and granted August 5, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 3, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 3, 2011.
- 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.