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Expired European patentEurope

PCM switching element

EP 0039948 B1 · Applicant: CSELT Centro Studi e Laboratori Telecomunicazioni S.p.A.

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Overview

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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 May 12, 1981 and granted August 29, 1984. A European patent lasts at most 20 years from filing, so its term ended May 12, 2001.
  • 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 November 12, 2006.
  • 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.
FiledMay 12, 1981
PublishedNovember 18, 1981
GrantedAugust 29, 1984
Term endedMay 12, 2001
Application numberEP 81103628
Classification (CPC)H04Q11/08

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedMay 12, 1981PublishedNov 18, 1981Patent grantedAug 29, 1984Term endedMay 12, 2001

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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.