Coated abrasive material containing abrasive filaments
CA 2015547 C · Owner: Kelly, Robert G. · Inventors: Kelly, Robert G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This patent claims coated abrasive products such as abrasive belts or discs comprising a backing and abrasive particles adhered to the backing by a maker coat. The abrasive particles comprise sintered alpha alumina crystallites with a crystallite size of less than 10 microns and have a predetermined shape that is preferably filamentary with an aspect ratio greater than 1.
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 26, 1990 and granted January 25, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 26, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 26, 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.