Method and system for data communications using synchronizing signals of different data length
CA 2228696 C · Owner: Denso Corporation · Inventors: Ando, Toshihide
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A road side communication equipment is provided crossing over lanes of an expressway, so that a communication processing for toll collection is executed between the road side equipment and an on-board equipment passing a communication area. The road side equipment sends signals using a 32-bit synchronizing signal for the start slot of each frame and a 16-bit synchronizing signal for subsequent slots of the frame. The on-board equipment receives this to perform signal receiving processing. The received communication signals are then digital-demodulated and entered to a shift register so that the bit pattern is compared in two comparators to detect the synchronizing signal. According to the …
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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 January 30, 1998 and granted November 19, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 30, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 30, 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
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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.