Dual microprocessor control system
CA 1301945 C · Owner: Perzan, Wayne A. · Inventors: Smith, Scott W.; Holtey, Thomas O.; Murray, Thomas L. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A microprocessor control system for use in an asynchronous data communication system and comprising a receive microprocessor and a transmit microprocessor along with a paged memory for storing channel line tables Separate receive and, transmit channel number registers control access to the paged memory. Control means is provided preferably in the form of a programmable memory for controlling the sequencing of channel numbers whereby one microprocessor is adapted to access channels in an incrementing manner while the other accesses in decrementing manner. When one miroprocessor gains access to a specific line table excludes the other microprocessor from accessing that line table until 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
- Granted May 26, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 26, 2009.
- 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.