Shaded code
CA 1333198 C · Owner: Tomioka, Makoto · Inventors: Tomioka, Makoto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A shaded code comprising one or more units divided into a number of regions. Each of the regions is either completely shaded or remains blank. The combinations of shaded regions are used to represent a particular character in the shaded code. The shaded code having been printed or manually written onto an information sheet maybe be accurately read without making the regions excessively large and even in the presence of an overflow of printing.
Read the whole patent
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 November 22, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 22, 2011.
- 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.