Apparatus for control and data transfer between a serial data transmission medium and a plurality of devices
CA 1066812 A · Owner: International Business Machines Corporation · Inventors: Malm, Richard L.; Machol, Guenther K.; Homan, Merle E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, Apparatus under microprocessor control for use in communicating over a serial communication loop with a remote attached control unit. It is capable of establishing frame synchronization interpreting commands, assembling, data and transmitting bits on the loop. The apparatus also communicates with I/O devices over a demand/response interface. A microprocessor interface with the loop includes loop sync control which establishes bit synchronization and generates a restart pulse at bit receive time and bit send time. The execution of instructions by the microprocessor is stopped and the microprocessor enters a wait state when it has finished all previous work and is …
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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 November 20, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 20, 1996.
- 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.