Color-coded system for selection of rf input terminals and associated scan lists
CA 2048752 C · Owner: Keenan, Douglas Marvin · Inventors: Keenan, Douglas Marvin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a television receiver including a plurality of RF input terminals, each of which having a respective scan list the channel, numbers of respective scan lists are displayed in respective colors to indicate to the viewer which RF input terminal and associated scan list is selected. In one embodiment of the invention the RF input terminals, and the antenna selection keys of a user-operable keyboard are color-coded to correspond to the color-coded channel numbers.
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 8, 1991 and granted October 7, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 8, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 8, 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.