Method of modifying a surface of a structured wafer
CA 2374004 A1 · Owner: 3M Innovative Properties Company · Inventors: Pendergrass, Daniel B. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of modifying a surface comprising the steps of: (a) contacting the surface to be modified with a working surface (47) of an abrasive article (40), the abrasive article comprising a phase separated polymer (44) having a first phase and a second phase, the first phase being harder than the second phase; and (b) relatively moving the surface to be modified and the fixed abrasive article to remove material from the surface to be modified in the absence of an abrasive slurry.
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 18, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 18, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 18, 2021.
- 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.