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Expired Canadian patentCanada

Slow blow fuse

CA 1250871 A · Owner: Sumitomo Wiring System, Ltd. · Inventors: Matsunaga, Katsumi; Tsuji, Yoshitsugu

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

A slow blow fuse comprising a fuse element section and a pair of electrical terminals integrally formed with the opposite ends of the fuse element section is disclosed. The fuse element section and the electrical terminals are formed of a high melting point metal and heat accumulators formed of aluminium are secured to the opposite ends of the fuse element section in heat transfer relationship therewith.

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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 March 7, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 7, 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.
FiledDecember 30, 1985
GrantedMarch 7, 1989
Term endedMarch 7, 2006
Patent numberCA 1250871 A
Classification (IPC)H01H85/04

Timeline

Timeline From CIPO dates

1986198919921995199820012004Application filedDec 30, 1985Patent grantedMarch 7, 1989Term endedMarch 7, 2006

Sources & verification

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