Finishing and abrasive tool
CA 2358217 A1 · Owner: Van Voorhis, Mark K. · Inventors: Beechey, Timothy J. J.; Van Voorhis, Mark K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A finishing star or spinner abrasive tool is formed of inner and outer packs of square sheets of abrasive cloth or sandpaper with the inner packs angularly offset from the outer packs on the mandrel axis. Each sheet is formed with discontinuous radial slits extending beyond an unslit center section, around a center fastener forming the mandrel drive hole. The slits provide surface flexibility while maintaining sheet integrity as it wears to circular form. An optional backing core is provided in the middle of the tool in the form of a, cloth-sisal quilt acting as a cushion backing for the sheets and which may, retain coolant or compound during operation. The tool has longer working life …
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 3, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 3, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 3, 2023.
- 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.