Preparation whose coloring depends on the viewing angle
CA 2210893 C · Owner: Huber, Annemarie · Inventors: Muller-Rees, Christoph; Huber, Annemarie
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to cosmetic or pharmaceutical preparations comprising pigments whose coloring depends on the viewing angle and comprising additives which are customary for cosmetic or pharmaceutical preparations wherein the pigments comprise at least one oriented crosslinked substance having a liquid-crystalline structure with a chiral phase, are plateletlike in form and have a thickness of 1 - 20 µm.
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 July 21, 1997 and granted June 5, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 21, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 21, 2019.
- 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.