Patent Yard Sign in
Expired European patentEurope

Method for producing glass preform for optical fiber

EP 0182250 B1 · Applicant: SUMITOMO ELECTRIC INDUSTRIES LIMITED

EPO PDF

Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

Read the whole patent

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.

Google PatentsEPO PDF

Why it's free to use

  • Filed November 12, 1985 and granted September 11, 1991. A European patent lasts at most 20 years from filing, so its term ended November 12, 2005.
  • 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 May 12, 2011.
  • 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.
FiledNovember 12, 1985
PublishedMay 28, 1986
GrantedSeptember 11, 1991
Term endedNovember 12, 2005
Application numberEP 85114363
Classification (CPC)C03B37/01211

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedNov 12, 1985PublishedMay 28, 1986Patent grantedSep 11, 1991Term endedNov 12, 2005

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.