Abrasive material
CA 2010991 C · Owner: Sumitomo Chemical Co. Ltd. · Inventors: Harakawa, Masaji; Hayashi, Mikio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to an abrasive material in a shaped form suitable for grinding abrading, or cutting various articles. The abrasive material has high abrasion performance and high mechanical strength and is characterized in that it comprises alumina fibers of 3 to 100 µm in diameter and not more than 10 % in coefficient of variation of diameter bonded with a resin.
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 February 27, 1990 and granted September 7, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 27, 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.
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.