Optical identification system and reader for reading optical gratings on a record medium
CA 1080523 A · Owner: Ncr Corporation · Inventors: Hale, William J.; Horst, William R.; Mort, Charles F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical identification system including a reader for reading superimposed optical gratings on a record medium in which the reader has a grating plane and a radiant energy source for directing energy therefrom along an optical axis to the grating plane. Detectors are positioned in the reader to receive diffracted beams from the optical gratings on a record medium positioned at the grating plane. The reader also includes an optical imaging system having a concave lens for directing a zero order reflected beam which is displaced from the optical axis back to the grating plane to enable the resulting beams diffracted from the optical gratings to be received at the detectors whenever a record …
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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 July 1, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 1, 1997.
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Timeline
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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.