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Expired Canadian patentCanada

Rotary switch using a flexible circuit member

CA 1136187 A · Owner: Northern Telecom Limited · Inventors: Chu, Pak-Jong

CIPO record

Overview

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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 of the Disclosure, A switch using one or more flexible circuit members provides for rolling contact between circuit members. One circuit member is attached to and wraps round a roller and the other, circuit member, which may be flexible or rigid is supported so that as the roller rotates it rolls, the circuit member attached to the roller changing its contact position with the other circuit member. Conductive patterns on the circuit members are moved into contact and out of contact with each other and can provide varying forms of switching arrangements, for example, normally made to break normally, broken to make, and transfer. Electronic devices can be mounted on either or both …

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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 November 23, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 23, 1999.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 1, 1980
GrantedNovember 23, 1982
Term endedNovember 23, 1999
Patent numberCA 1136187 A
Classification (IPC)H01H1/16 +2 more

Timeline

Timeline From CIPO dates

1981198319851987198919911993199519971999Application filedDec 1, 1980Patent grantedNov 23, 1982Term endedNov 23, 1999

Sources & verification

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