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Expired Canadian patentCanada

Telephone line protector with line disconnect and an entrance terminal assembly incorporating a plurality of protectors

CA 1270553 C · Owner: Nortel Networks Corporation · Inventors: Kupferschmidt, Albert

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 of the Disclosure, A housing for a telephone line protector comprises a well in which are positioned two spring biased members. A first spring biased member is adjacent to the back end of the well and biased away therefrom. The second spring biased member is axially aligned with and biased away from the first spring biased member. One line conductor is connected to the first spring biased member and the other line conductor is connected to a terminal at the back end. The spring bias of the second spring biased member is stronger than the bias of the first spring biased member. Insertion of a protector module first causes movement of the first spring biased member to contact the …

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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 19, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 19, 2007.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 15, 1987
GrantedJune 19, 1990
Term endedJune 19, 2007
Patent numberCA 1270553 C
Classification (IPC)H02H3/22 +2 more

Timeline

Timeline From CIPO dates

1988199019921994199619982000200220042006Application filedJuly 15, 1987Patent grantedJune 19, 1990Term endedJune 19, 2007

Sources & verification

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