Signal recognition arrangement using cadence tables
CA 2189282 C · Owner: At&T Corp. · Inventors: Roybal, Larry John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A call classifier (300, 500) for recognizing cadenced signals (100-103) is based on data tables (110, 111) whose contents define the cadences of the signals that need to be recognized. Consequently the call classifier may be adapted forrecognizing the cadenced signals of various signaling schemes that are used in various countries or telecommunication systems simply by reprogramming the datacontents of the data tables. Each cadenced signal comprises a different pattern of interleaved signal-on (P) intervals and signal-off (S) intervals. A separate cadence timing table-pair (200-204) corresponds to each sequential S/P interval-pair. Each table-pair includes a P table (210) and an S table …
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 31, 1996 and granted March 30, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 31, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 31, 2018.
- 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.