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Expired Canadian patentCanada

Universal protocol data receiver

CA 1255007 A · Owner: American Telephone And Telegraph Company · Inventors: Riddle, Guy G.; Marshall, William T.; Fraser, Alexander G.

CIPO record

Overview

Drawings and full text

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

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Abstract From the Canadian patent

Abstract:, The present invention relates to a data receiver. The data receiver is characterized by a first-in first-out, buffer storge unit, a movable barrier in the storage unit for dividing the storage unit into two parts and a unit for limiting access to one of the two parts. The invention is further related to a method of processing data comprising the steps of loading the data into a multi-stage register which includes a movable barrier, testing the data while the data is behind the movable barrier and then moving the barrier behind the data when the testing is complete.

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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 May 30, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 30, 2006.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledFebruary 28, 1986
GrantedMay 30, 1989
Term endedMay 30, 2006
Patent numberCA 1255007 A
Classification (IPC)H04L1/00 +1 more

Timeline

Timeline From CIPO dates

1987198919911993199519971999200120032005Application filedFeb 28, 1986Patent grantedMay 30, 1989Term endedMay 30, 2006

Sources & verification

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