Asymmetrical encoding/decoding method and apparatus for communication networks
CA 2254396 C · Owner: At&T Corp. · Inventors: Giardina, Charles R.; Rudrapatna, Ashok N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In accord with the transmission system encoded signals may be processed in intermediate stations and at receiving stations in an order different from the order of the original encoding process for transmission. In particular the recovery of CDMA encoded signals does not require application of spreading/despreading codes in the original scheme or sequence of application ofspreading codes. In one embodiment code applications may be permuted without losing the original signal which has been encoded. In such applications not all of the encoding spreading functions results in an increased spreading rate.
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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 November 18, 1998 and granted July 30, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 18, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 18, 2020.
- 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.