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Expired European patentEurope

Optical parametric circuit

EP 0708357 B1 · Applicant: NIPPON TELEGRAPH AND TELEPHONE 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 October 11, 1995 and granted May 24, 2000. A European patent lasts at most 20 years from filing, so its term ended October 11, 2015.
  • 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 April 11, 2021.
  • 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.
FiledOctober 11, 1995
PublishedApril 24, 1996
GrantedMay 24, 2000
Term endedOctober 11, 2015
Application numberEP 95402273
Classification (CPC)G02F1/3536

Timeline

Timeline From EPO dates

1996199820002002200420062008201020122014Application filedOct 11, 1995PublishedApril 24, 1996Patent grantedMay 24, 2000Term endedOct 11, 2015

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.