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Expired European patentEurope

Polarised plane-maintaining optical fiber

EP 0109604 B1 · Applicant: HITACHI, LTD.

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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 January 9, 1981 and granted September 27, 1989. A European patent lasts at most 20 years from filing, so its term ended January 9, 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 July 9, 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.
FiledJanuary 9, 1981
PublishedMay 30, 1984
GrantedSeptember 27, 1989
Term endedJanuary 9, 2001
Application numberEP 83111109
Classification (CPC)C03B37/018 +2 more

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedJan 9, 1981PublishedMay 30, 1984Patent grantedSep 27, 1989Term endedJan 9, 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.