Tape recording method and apparatus
CA 2124080 C · Owner: Tsai, Irving · Inventors: Tsai, Irving
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cassette recording system having both a primary memory (1) and an auxiliary memory (50) associated with the cassette. A mechanism is provided for sequentially reading information from and writing information to the primary memory (1) as well as randomly reading, information from and writing information to the auxiliary memory. The auxiliary memory may be used to retain programming information. The system enables a cassette to be transferred from one recorder to another, with the recording schedule being included in the auxiliary memory associated with the cassette being similarly transferred.
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
- Filed November 18, 1992 and granted January 22, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 18, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 18, 2014.
- 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.