Embedded signalling
CA 2126099 C · Owner: Bolt Beranek & Newman Inc. · Inventors: Huggins, A. W. F.; Preuss, Robert David; Bergamo, Marcos Antonio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In this embedded signalling system a sequence of code symbols representing digital information is generated (100). A code signal representing this sequence is generated (200) which is dynamically , filtered to form a modified code signal (300) which is, combined (400) with a higher level audio signal to form a composite audio signal for transmission.
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 10, 1992 and granted November 4, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 10, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 10, 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.