Videotex system provided with protection means against transmission errors
CA 1161546 A · Owner: Roche, Christian · Inventors: Marti, Bernard; Fournier, Claude; Poignet, Alain
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Videotex system provided with protection means against transmission errors; the invention provides for the introduction of a redundant sequence of control codes, at least for the main controls. Supplementary codes are associated with conventional codes to form redundant sequences, said codes having no particular significance for receivers not equipped with redundancy exploitation elements. It can be used in the transmission and display of data on television receivers for entertainment, information or instructional purposes.
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 January 31, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 31, 2001.
- 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.