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Expired European patentEurope

Symmetrical optical device

EP 0360833 B1 · Applicant: AT&T Corp.

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Overview

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

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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 26, 1988 and granted May 19, 1993. A European patent lasts at most 20 years from filing, so its term ended February 26, 2008.
  • 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 26, 2013.
  • 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 26, 1988
PublishedApril 4, 1990
GrantedMay 19, 1993
Term endedFebruary 26, 2008
Application numberEP 88905471
Classification (CPC)H10F77/146 +2 more

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedFeb 26, 1988PublishedApril 4, 1990Patent grantedMay 19, 1993Term endedFeb 26, 2008

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.