Patent Yard Sign in
Expired European patentEurope

Method of forming insulating films, capacitances, and semiconductor devices

EP 0468758 B1 · Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

EPO PDF

Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

Read the whole patent

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.

Google PatentsEPO PDF

Why it's free to use

  • Filed July 24, 1991 and granted March 26, 1997. A European patent lasts at most 20 years from filing, so its term ended July 24, 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 January 24, 2017.
  • 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, 1991
PublishedJanuary 29, 1992
GrantedMarch 26, 1997
Term endedJuly 24, 2011
Application numberEP 91306729
Classification (CPC)C23C14/0036 +2 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedJuly 24, 1991PublishedJan 29, 1992Patent grantedMarch 26, 1997Term endedJuly 24, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.