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Expired European patentEurope

Method for preparing glass substrate for magnetic recording medium

EP 1157975 B1 · Applicant: Mitsui Mining and Smelting Co., Ltd

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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 22, 2000 and granted April 2, 2003. A European patent lasts at most 20 years from filing, so its term ended May 22, 2020.
  • 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 22, 2025.
  • 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 22, 2000
PublishedNovember 28, 2001
GrantedApril 2, 2003
Term endedMay 22, 2020
Application numberEP 00110274
Classification (CPC)C03C19/00 +1 more

Timeline

Timeline From EPO dates

2001200320052007200920112013201520172019Application filedMay 22, 2000PublishedNov 28, 2001Patent grantedApril 2, 2003Term endedMay 22, 2020

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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