Nacreous pigments
CA 1302663 C · Owner: Knapp, August · Inventors: Bruckner, Hans-Dieter; Knapp, August; Ambrosius, Klaus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Platelet-shaped coloured pigments in which a platelet-shaped substrate is provided with a compact coating containing iron(II) oxide, which coating has a high gloss and, depending on the layer thickness, shows, the interference colour of thin platelets are described.
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
- Granted June 9, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 9, 2009.
- 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.