Serial keyboard interface system
CA 1205205 A · Owner: International Business Machines Corporation · Inventors: Tajima, Satoshi; Watanabe, Shinpei
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In data processing systems it has been proposed that a keyboard and a data processing unit be interconnected through a data line and a clock line so as to transmit keyboard outcodes bit-serially through the data line and to transmit a keyboard out clock signal through the clock line. This could result in false operation however due to noise being induced in the interconnecting cables from both the data and clock lines resulting in false operation and incorrect data being transmitted. The present invention which provides a serial keyboard interface system overcomes the problem of erroneous transmission of keyboard data due to noise pulses induced in the interconnecting lines. Data signals …
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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
- Granted May 27, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 27, 2003.
- 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.