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Expired European patentEurope

A method for the poling treatment of a lithium tantalate single crystal

EP 0191671 B1 · Applicant: Shin-Etsu Chemical 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 January 21, 1986 and granted September 21, 1988. A European patent lasts at most 20 years from filing, so its term ended January 21, 2006.
  • 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 21, 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.
FiledJanuary 21, 1986
PublishedAugust 20, 1986
GrantedSeptember 21, 1988
Term endedJanuary 21, 2006
Application numberEP 86400118
Classification (CPC)C30B15/00 +2 more

Timeline

Timeline From EPO dates

1987198919911993199519971999200120032005Application filedJan 21, 1986PublishedAug 20, 1986Patent grantedSep 21, 1988Term endedJan 21, 2006

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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