Ether sulfates for oral hygiene and dental care preparations
CA 2100881 A1 · Owner: Raths, Hans-Christian · Inventors: Gantke, Karl-Heinz; Breitzke, Wille; Raths, Hans-Christian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are alkyl ether sulphate mixtures of the formula R1-O-(C2H4O)x-SO3M in which R1 is a straight-chain group with 12-18 C-atoms, M is an alkali or magnesium ion and x has a mean value of 2-10, at least 50 % by wt. of the mixture consisting of homologues with x-1 to x+1 glycol ether groups and the alkyl sulphate content being less than 10 % by wt. when x=0. Such mixtures are suitable for use as neutral-tasting mucous-membrane-compatible surface-active agents in mouth- and tooth-care agents. They are preferably used in the form of free-flowing powders consisting of 0.1-2 parts by wt. of the alkyl ether sulphate mixture to 1 part by wt. of an inert substrate, preferably fine …
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 December 13, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 13, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 13, 2013.
- 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.