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Expired European patentEurope

Process for producing nitrogen doped semiconductor wafers

EP 1081254 B1 · Applicant: Wacker Siltronic Gesellschaft für Halbleitermaterialien Aktiengesellschaft

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Overview

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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 August 17, 2000 and granted November 21, 2001. A European patent lasts at most 20 years from filing, so its term ended August 17, 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 February 17, 2026.
  • 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.
FiledAugust 17, 2000
PublishedMarch 7, 2001
GrantedNovember 21, 2001
Term endedAugust 17, 2020
Application numberEP 00117291
Classification (CPC)C30B13/00 +2 more

Timeline

Timeline From EPO dates

2001200320052007200920112013201520172019Application filedAug 17, 2000PublishedMarch 7, 2001Patent grantedNov 21, 2001Term endedAug 17, 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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