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Expired European patentEurope

Method of fabricating optical fiber preforms

EP 0150247 B1 · Applicant: SUMITOMO ELECTRIC INDUSTRIES LIMITED

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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 31, 1984 and granted October 19, 1988. A European patent lasts at most 20 years from filing, so its term ended January 31, 2004.
  • 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 31, 2009.
  • 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 31, 1984
PublishedAugust 7, 1985
GrantedOctober 19, 1988
Term endedJanuary 31, 2004
Application numberEP 84100968
Classification (CPC)C03B37/0142

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedJan 31, 1984PublishedAug 7, 1985Patent grantedOct 19, 1988Term endedJan 31, 2004

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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