Expired Canadian patentCanada
Abrasive disks and method of making
CA 2080329 C · Owner: Grimes, John R. · Inventors: Grimes, John R.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disks far heavy grinding are made by, stamping uncoated backing material to provide a plurality of interconnected disk shapes. The shapes are notched or weakened for separation. The inter-connected shapes are then covered with abrasive embedded in adhesive.
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 October 9, 1992 and granted August 10, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 9, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 9, 2014.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledOctober 9, 1992
GrantedAugust 10, 1999
Term endedOctober 9, 2012
Patent numberCA 2080329 C
Classification (IPC)B24B53/00 +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.