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Expired European patentEurope

Apparatus for equipment unit protection switching

EP 0534675 B1 · Applicant: AT&T Corp.

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Listed from its EPO record in Patent Yard's archive of European patents past their term. Its claims, description and drawings are in the EPO PDF and on Google Patents, and the Claude kit works from them.

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Why it's free to use

  • Filed September 17, 1992 and granted November 20, 1996. A European patent lasts at most 20 years from filing, so its term ended September 17, 2012.
  • A supplementary protection certificate, which can extend a medicine or crop-protection patent, adds at most five and a half years, so even that would have ended by March 17, 2018.
  • We check European rights only. A US or other national patent in its family could still be in force: check its family on Espacenet or Google Patents.
FiledSeptember 17, 1992
PublishedMarch 31, 1993
GrantedNovember 20, 1996
Term endedSeptember 17, 2012
Application numberEP 92308470
Classification (CPC)H05K7/1414

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedSep 17, 1992PublishedMarch 31, 1993Patent grantedNov 20, 1996Term endedSep 17, 2012

Sources & verification

Official EPO records

Full published documentClaims, description and drawings as a PDF.EPOEuropean Patent RegisterProcedure, status, file inspection and legal events.EPOLinked open EP data recordThe bibliographic record this page is built from.EPO

Cross-check elsewhere

Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.comEspacenetNational family members and their legal status.European Patent Office

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