Communication method and apparatus with transmission of a second signal during absence of a first one
CA 2203523 C · Owner: International Mobile Satellite Organization · Inventors: Feldman, Howard Ray
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A network station (4) receives a principal signal (S) and data (D). When the principal signal (S) is present or contains information it is transmitted to , a receiving station (6) through a communication channel. When the principal signal (S) is absent or does not have a significant information content the , network station (4) transmits the data (D) through the same communication channel in a format such that the data (D) is received and output by a further receiving station (8).
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 October 27, 1995 and granted October 16, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 27, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 27, 2017.
- 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.