Expired Canadian patentCanada
Intensely colored nacreous pigments
CA 2108747 C · Owner: The Mearl Corporation · Inventors: Birch, Thomas J.; Sullivan, William J.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Iron oxide-coated micaceous pigments having a chroma enhancing amount of a coating of a colorless metal oxide which has a refractive index of at least about 2.0 exhibit intensely colored effects.
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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 October 19, 1993 and granted January 26, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 19, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 19, 2015.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledOctober 19, 1993
GrantedJanuary 26, 1999
Term endedOctober 19, 2013
Patent numberCA 2108747 C
Classification (IPC)C09C1/24 +2 more
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.