Expired Canadian patentCanada
Method for the production of synthetic rutile
CA 2182123 C · Owner: Vaaldiam Mining Inc. · Inventors: Balderson, Graham F.; Macdonald, Charles A.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Synthetic Rutile is prepared from raw ilmenite ore by a method comprising activating ilmenite and subjecting it to a multi-stage countercurrent leaching process in hot hydrochloric acid.
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 26, 1996 and granted October 5, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 26, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 26, 2018.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 26, 1996
GrantedOctober 5, 1999
Term endedJuly 26, 2016
Patent numberCA 2182123 C
Classification (IPC)C01G23/05 +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.