Method and apparatus for surface polishing
CA 2100227 A1 · Owner: Tsutsumi, Katsuji · Inventors: Tsutsumi, Katsuji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A washing liquid and a granular substance in the quantity equivalent to or more than the liquid in the specific gravity are accommodated in a barrel in a manner to position the surface of the liquid above the top surface of a granular substance layer at a stationary state of the barrel, and the barrel is swung with an object to be washed which is accommodated therein to wash away stains firmly stuck. In the same manner various treatment liquid such, as a plating liquid and a granular substance which possess conductivity or without conductivity are accommodated in the barrel with an object to be treated. By swinging the barrel, the treatment liquid and the granular substance are stirred and …
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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 July 9, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 9, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 9, 2015.
- 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.