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Expired Canadian patentCanada

Broadband signal switching matrix network

CA 1330232 C · Owner: Wolkenhauer, Jan · Inventors: Trumpp, Gerhard; Wolkenhauer, Jan

CIPO record

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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 broadband signal switching matrix network having a cross-point matrix in FET technology whose switching elements, controlled by a holding memory cell are each formed with a series circuit of a switching transistor and of an input transistor. Matrix output lines thereof are respectively connected to one terminal of the operating voltage source via a pre-charging transistor that is controlled by a pre-charging clock that side of the series circuit connected opposite from the matrix output line being permanently connected to the other terminal of the operating voltage source (directly or via a transistor controlled by the output signal and individually associated to the matrix output …

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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 14, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 14, 2011.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledAugust 4, 1989
GrantedJune 14, 1994
Term endedJune 14, 2011
Patent numberCA 1330232 C
Classification (IPC)H04Q3/52 +1 more

Timeline

Timeline From CIPO dates

19901993199619992002200520082011Application filedAug 4, 1989Patent grantedJune 14, 1994Term endedJune 14, 2011

Sources & verification

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