Expired Canadian patentCanada
Binary signal producing apparatus for optical character recognition
CA 1297983 C · Owner: Nec Corporation · Inventors: Nakano, Kazumi; Umeda, Tetsuo; Kasuya, Shigenobu
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical character recognition apparatus comprises a binary signal producing apparatus which produces an optimum binary signal from a multi-value image signal obtained from a scanner.
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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 24, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 24, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 10, 1987
GrantedMarch 24, 1992
Term endedMarch 24, 2009
Patent numberCA 1297983 C
Classification (IPC)G06K9/38
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.