Digital transmission system for encoding and decoding attribute data into error checking symbols of main data, and method therefor
CA 2206688 C · Owner: British Telecommunications Public Limited Company · Inventors: Wong, Wing Tak Kenneth
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Data are coded by means of a first error correcting code to produce first coded bits. Control data are coded using a heavily redundant second error corrected code and added modulo 2 to the first coded bits. Decoding is performed by ascertaining (15, 16) which valid codeword of the second code (when added to the received codeword) gives the lowest error count when the resultant is decoded according to the first code.
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 12, 1995 and granted February 19, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 12, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 12, 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.