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Expired European patentEurope

Process for producing macrocrystalline silicon sheets with directional grains

EP 0013985 B1 · Applicant: HELIOTRONIC Forschungs- und Entwicklungsgesellschaft für Solarzellen-Grundstoffe mbH

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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 24, 1980 and granted September 2, 1981. A European patent lasts at most 20 years from filing, so its term ended January 24, 2000.
  • 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 24, 2005.
  • 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 24, 1980
PublishedAugust 6, 1980
GrantedSeptember 2, 1981
Term endedJanuary 24, 2000
Application numberEP 80100358
Classification (CPC)C30B15/06 +1 more

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedJan 24, 1980PublishedAug 6, 1980Patent grantedSep 2, 1981Term endedJan 24, 2000

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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