Hydrophilic polymer-silicate mineral complex material and use thereof
CA 2044151 C · Owner: Takahashi, Tadahito · Inventors: Yamaguchi, Michihiro; Yanaki, Toshio; Nagasawa, Yoko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A complex material of a hydrophilic polymer-silicate mineral comprising a carboxyl group containing hydrophilic polymer and a water swellable silicate mineral, and having a new absorption spectrum not existing in both starting materials in the IR-ray absorption spectrum within the range of 1000 to 1300 cm-1, and pharmaceutical and cosmetic compositions comprising same.
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 19, 1990 and granted January 9, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 19, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 19, 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.