Manually codeable cards for card readers
CA 1293053 C · Owner: Lee, Jeun-Kuen · Inventors: Lin, Jui-Chang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A kind of manually codeable card for card readers composed of an upper and a lower sheet of transparent material glued together, the lower sheet printed with black ink all over except a plurality of transparent circles which can be sticked on to become opaque with black circles from a paper with transposable black circles or round opaque stickers. The coded number of the card is represented by the different combination of transparent and opaque circles.
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 December 10, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 10, 2008.
- 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.