Catv subscriber disconnect switch
CA 2031603 C · Owner: Blonder Tongue Laboratories, Inc. · Inventors: Farmer, James O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Television service denial apparatus comprises a microprocessor controller for controlling the generation of a control signal waveform. The control signal toggles a program denial device between first and second conditions. The program denial device responsive to the control signal, waveform only periodically outputs a television signal spectrum to which a sophisticated television receiver is able to synchronize. Consequently, the program denial device may be a device having only 20 dB of signal isolation. In one embodiment, the program denial device comprises a signal modulator for modulating an incoming television signal spectrum including one continuous wave carrier channel having no …
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 December 5, 1990 and granted December 3, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 5, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 5, 2012.
- 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.