An optical device for roughness measurement
CA 2246115 A1 · Owner: Kourilovitch, Andrei · Inventors: Mewdeleev, Vladimir Ya; Sergey, Scovorod'Ko N.; Kourilovitch, Andrei
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
These present inventions represent optical devices for remote measurement of one-dimension roughness. These devices allow the measurement of the roughness automatically with the use of a computer. The first method for the measurement: The interference one-dimension pattern is formed on the rough surface. The direction of a roughness coincides with the direction of the interference pattern. If the, bandwidth in the interference pattern is equal to the period of the roughness then the, light reflected from a rough surface has maximum or minimum intensity. By changing, bandwidth in interference pattern and synchronously measuring intensity of the light, reflected from a rough surface, it is …
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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 September 15, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 15, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 15, 2020.
- 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.