Mechanochemical polishing abrasive
CA 2039998 A1 · Owner: Zipperian, Donald C. · Inventors: Zipperian, Donald C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A mechanochemical polishing abrasive and a process for using the mechanochemical polishing abrasive to polish the surface of a hardened workpiece cheaply and efficiently. The mechanochemical polishing abrasive comprises a slurry of colloidal silica and a mechanical abrasive selected from one or more of the materials in the group comprising Fe2O3 Fe3O4, MgO, BaCO3, CaCO3, MnO2, CeO, SiO2 CeO2, Cr2O3. and Al2O3.
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 8, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 8, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 8, 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.