Multiple abrasive assembly and method
CA 2273963 A1 · Owner: Rivard, Allen J. · Inventors: Minick, Chris A.; Fitzel, Galen A.; Rivard, Allen J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An abrasive article is formed from a lofty nonwoven abrasive pad and one or more abrasive sheets. In one embodiment each sheet has an abrasive layer on , its front side and a plurality of engagement stems on its back side. Enough of the engagement stems engage fibers on the surface of the nonwoven pad to affix the two components together for workpiece surface treatment. In another embodiment, the nonwoven pad has a slit therein and each abrasive sheet has a , portion thereof inserted into its respective slit to anchor the sheet to the pad. In this embodiment, each sheet has an abrasive layer on its front side but may have no stems on its back side. In either embodiment the sheets are …
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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 November 3, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 3, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 3, 2019.
- 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.