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Expired Canadian patentCanada

Method and apparatus for testing electronic equipment

CA 1237775 A · Owner: Tektronix, Inc. · Inventors: Springer, Richard A.

CIPO record

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Abstract From the Canadian patent

18-, Abstract of the Disclosure, A microprocessor-based apparatus for testing the electrical condition of electronic circuitry par-, titularly computers, employs a buffer and a latch associated with each of the address bus and the data bus to provide electrical isolation of said buses. In using the apparatus, the integrity of a central testin "kernel" comprising the testing program itself with its testing data in ROM is first verified. The testing program then evaluates, in order the data, bus, the address bus, and then such additional and addressable circuitry as may be connected to said data bus and address bus. Incorporation of analog-to-digital converters permits determination of actual …

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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 June 7, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 7, 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.
FiledJune 25, 1985
GrantedJune 7, 1988
Term endedJune 7, 2005
Patent numberCA 1237775 A
Classification (IPC)G01R31/28 +2 more

Timeline

Timeline From CIPO dates

1986198819901992199419961998200020022004Application filedJune 25, 1985Patent grantedJune 7, 1988Term endedJune 7, 2005

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