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Expired Canadian patentCanada

Multiplexed noise coded switching system

CA 1192647 A · Owner: The Government Of The United States As Represented By The Secretary Of The Army · Inventors: Gutleber, Frank S.

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Abstract From the Canadian patent

A switching system for performing line to line or group to group switching of communication signals modulated by multiplexed noise codes. The noise codes comprise a subclass or set of multiplexed noise codes consisting of code mate pairs which provide an impulse autocorrelation function when detected and furthermore crosscorrelate to zero at a time when the code mate pairs compress to an impulse providing thereby orthogonal operation, meaning that there is no mutual interference between any of the input/output lines when the signals are translated thereon concurrently. Plural sets of noise code generators and code selectors are coupled to predetermined ones of a plurality of sets of matched …

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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 August 27, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 27, 2002.
  • 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 9, 1983
GrantedAugust 27, 1985
Term endedAugust 27, 2002
Patent numberCA 1192647 A
Classification (IPC)H04M3/42 +1 more

Timeline

Timeline From CIPO dates

1984198619881990199219941996199820002002Application filedJune 9, 1983Patent grantedAug 27, 1985Term endedAug 27, 2002

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