Signal transmission in teaching system
CA 1096610 A · Owner: Sony Corporation · Inventors: Komatsubara, Michimasa; Shimizu, Ikuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a teaching system having a central or master station and one or more student stations remote from the master station, there are provided, at the master station at least one source of main signals in a first frequency band, which source may be constituted by a tape or other record player for reproducing Leaching or instructional materials, a microphone or other source of audio signals from a proctor or supervisor of the teaching system and a source, of control signals which may include address signals for identifying one of the student stations and command signals for controlling various operations of the addressed student station. The audio and control signals are employed to modulate …
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 March 3, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 3, 1998.
- 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.