Apparatus and method for measuring dark and bright reflectances of sheet material
CA 1315124 C · Owner: Burk, Gary Neil · Inventors: Burk, Gary Neil
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus (10) and methods for measuring dark and bright reflectances of translucent sheet material (2) are disclosed. A first optical means illuminates one side of the sheet (2) with a source of electromagnetic radiation. A portion of the radiation is transmitted through the sheet (2) and another portion is reflected by the sheet. Optical gating means (30) are positioned adjacent the other side of the sheet (2) in a fixed position relative to the first optical means. The optical gating means (30) absorbs substantially all of the transmitted portion of the radiation when switched to a dark state and reflects substantially all of the transmitted portion of the radiation back through the …
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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 March 30, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 30, 2010.
- 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.