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Expired Canadian patentCanada

Variable bandwidth control system

CA 1293338 C · Owner: Gte Laboratories Incorporated · Inventors: Shaio, Jack

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

Abstract An NpR variable bandwidth control system comprises a class of systems specifically designed to control the access to a T1 link by traffic types that require different fractions of the transmission facilities simultaneously. These systems can be incorporated into the software that is used to control DCS based T1 networks for special services. Essentially, wideband messages such as video signals are transmitted one at a time whereas low bit rate data signals such as voice are transmitted in parallel. Such a form of transmission makes economical sense in the transmitting of such signals. A proportion p is applied to one of the groups so that all data is equitably handled.

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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 December 17, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 17, 2008.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledSeptember 8, 1988
GrantedDecember 17, 1991
Term endedDecember 17, 2008
Patent numberCA 1293338 C
Classification (IPC)H04J3/17

Timeline

Timeline From CIPO dates

1989199119931995199719992001200320052007Application filedSep 8, 1988Patent grantedDec 17, 1991Term endedDec 17, 2008

Sources & verification

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