Spectrum spread communication by csk modulation
CA 2001349 C · Owner: Takahashi, Naomichi · Inventors: Tsumura, Soichi; Takahashi, Naomichi; Endo, Kaoru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In the CSK communication method and apparatus according to the invention, on the signal transmitting side two Manchester M series equal in code length are produced with a predetermined period. The Manchester M series to actually be transmitted has a maximum value of the absolute value of its autocorrelation which is always larger than that of the cross-correlation of the two Manchester M series. In every predetermined period, on of the two series is selected; the selection depends on whether the transmitting data is "1" or "0", so that the selected series is transmitted as a transmitting signal. On the signal receiving side a receiving, signal is compared with each of two Manchester M …
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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 October 24, 1989 and granted June 27, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 24, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 24, 2011.
- 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.