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Expired European patentEurope

Glass composition for making magnetic disk substrates and magnetic disk substrate

EP 0755901 B1 · Applicant: YAMAMURA GLASS 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 July 24, 1996 and granted November 21, 2001. A European patent lasts at most 20 years from filing, so its term ended July 24, 2016.
  • 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 January 24, 2022.
  • 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.
FiledJuly 24, 1996
PublishedJanuary 29, 1997
GrantedNovember 21, 2001
Term endedJuly 24, 2016
Application numberEP 96111881
Classification (CPC)C03C10/0045 +1 more

Timeline

Timeline From EPO dates

1997199920012003200520072009201120132015Application filedJuly 24, 1996PublishedJan 29, 1997Patent grantedNov 21, 2001Term endedJuly 24, 2016

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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