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Expired Canadian patentCanada

System for effectively paralleling computer terminal devices

CA 1234922 A · Owner: Clyde (A.R.) & Company · Inventors: Clyde, Robert A.

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

In a digital computing system such as the Digital Equipment Corporation's VAXTM computer system which uses the VMS operating system in which terminal devices are connected to the system through terminal dependent device drivers coupled to terminal independent device drivers so that the operating system of the computer system need not be modified each time a terminal device is added or subtracted, a system and method is provided for effectively paralleling an auxiliary terminal with a selected terminal of the system so that the selected terminal can be monitored for instruction, security, audit, or other purposes by, creating a user controlling driver and a user controlling device coupled …

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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 April 5, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 5, 2005.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 23, 1985
GrantedApril 5, 1988
Term endedApril 5, 2005
Patent numberCA 1234922 A
Classification (IPC)G06F13/20 +2 more

Timeline

Timeline From CIPO dates

1986198819901992199419961998200020022004Application filedApril 23, 1985Patent grantedApril 5, 1988Term endedApril 5, 2005

Sources & verification

Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.