System and method for a picture interphone using camcorder and tv
CA 2038746 C · Owner: Lee, Seoung E. · Inventors: Lee, Seoung E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A picture interphone system using an existing TV and camcorder without using special equipment as required by a conventional picture interphone system which is used only for its own exclusive use. The system disclosed is able to record the picture of the visitor while the user is not at home or wants to record the picture of the visitor. The camcorder and the TV are turned on by a switch pushed by the visitor and automatically turned off after the visitor leaves.
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 March 21, 1991 and granted July 22, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 21, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 21, 2013.
- 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.