Measurement of thin films minimizing wave interference effects
CA 1084296 A · Owner: Accuray Corporation · Inventors: Pugh, John F.; Williams, Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A property of a sheet material such as a thin, infrared, radiation-transmissive film of plastic or the like with specular surfaces is measured with substantial freedom from errors caused by wave interference effects, utilizing a radiation source for generating infrared radiation having a wavelength subject to absorption in the sheet material. Beams of the radiation are directed from a multiplicity of points as on the diffusively reflective inner surface of a sphere to a surface of the sheet material at a broad spectrum of incidence angles. Radiation leaving the sheet material is intercepted and redirected to a surface of the sheet material. The radiation is directed and redirected by …
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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
- Granted August 26, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 26, 1997.
- 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.