Coated abrasive containing erodable agglomerates
CA 2051607 A1 · Owner: Broberg, David E. · Inventors: Cosmano, Richard J.; Duwell, Ernest J.; Broberg, David E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to coated abrasives and, more, particularly, to coated abrasive products containing erodable agglomerates. Conventional coated abrasives typically consist of a single layer of abrasive grain adhered to a backing. It has been found that only up to about 15% of the grains in the layer are actually utilized in removing any of the workpiece. It has long been known that a coated abrasive containing an underlayer of conventional aluminum oxide grains and a top layer of individual premium abrasive grains provides satisfactory performance at a lower cost than a coated abrasive using 100% individual premium abrasive grains. However for, certain grinding applications, the …
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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 September 17, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 17, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 17, 2013.
- 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.