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Expired European patentEurope

Application of electronic properties of germanium to inhibit n-type or p-type dopant diffusion in silicon

EP 0452741 B1 · Applicant: NATIONAL SEMICONDUCTOR CORPORATION

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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 April 4, 1991 and granted March 6, 1996. A European patent lasts at most 20 years from filing, so its term ended April 4, 2011.
  • 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 October 4, 2016.
  • 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.
FiledApril 4, 1991
PublishedOctober 23, 1991
GrantedMarch 6, 1996
Term endedApril 4, 2011
Application numberEP 91105329
Classification (CPC)H10P30/204 +2 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedApril 4, 1991PublishedOct 23, 1991Patent grantedMarch 6, 1996Term endedApril 4, 2011

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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