Densitometer with error correction
CA 1319272 C · Owner: Given, William R. · Inventors: Bowden, David R.; Cargill, Mark A.; Given, William R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A densitometer system adapted for measuring color characteristics of a substantially opaque object sample under test, the system comprising:, light source means for generating light rays and directing the same onto the object sample; spectral filter means positioned at a predetermined angle relative to the direction of object illumination by the light source, and responsive to light rays reflected from the object sample so as to discriminate a predetermined color shade set of spectral responses of the reelected light rays;, detection means responsive to the light rays transmitted through the spectral filter means for generating on separate paths signals representative of the intensity of …
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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 June 22, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 22, 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.