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Expired European patentEurope

Electric field induced quantum well waveguides

EP 0470249 B1 · Applicant: AMOCO 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 February 15, 1991 and granted June 26, 1996. A European patent lasts at most 20 years from filing, so its term ended February 15, 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 August 15, 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.
FiledFebruary 15, 1991
PublishedFebruary 12, 1992
GrantedJune 26, 1996
Term endedFebruary 15, 2011
Application numberEP 91908490
Classification (CPC)G02F1/01708 +2 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedFeb 15, 1991PublishedFeb 12, 1992Patent grantedJune 26, 1996Term endedFeb 15, 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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