Program directory for a video tape cassette
CA 2115771 C · Owner: Yuen, Henry C. · Inventors: Kwoh, Daniel S.; Yuen, Henry C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A directory of programs recorded on a cassette tape is provided to facilitate recording and reviewing of the programs and allocating and deallocating of space on the tape. The directory is either stored on the cassette tape itself or on an external memory. Designs of the various components for providing and maintaining the directory are also disclosed.
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 August 17, 1992 and granted December 31, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 17, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 17, 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.