Expired Canadian patentCanada
Sintered sol gel alumina abrasive filaments
CA 2015319 C · Owner: Rue, Charles V. · Inventors: Rue, Charles V.; Klok, Richard J.; Pellow, Scott W.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A filament shaped sintered alumina based abrasive made up predominantly of fine alpha alumina crystals.
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 April 25, 1990 and granted August 16, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 25, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 25, 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.
FiledApril 25, 1990
GrantedAugust 16, 1994
Term endedApril 25, 2010
Patent numberCA 2015319 C
Classification (IPC)B24D3/00 +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.