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Expired European patentEurope

White-light interferometer

EP 0147481 B1 · Applicant: International Business Machines Corporation

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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 December 27, 1983 and granted September 2, 1987. A European patent lasts at most 20 years from filing, so its term ended December 27, 2003.
  • 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 June 27, 2009.
  • 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.
FiledDecember 27, 1983
PublishedJuly 10, 1985
GrantedSeptember 2, 1987
Term endedDecember 27, 2003
Application numberEP 83113120
Classification (CPC)G01B9/0209 +2 more

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedDec 27, 1983PublishedJuly 10, 1985Patent grantedSep 2, 1987Term endedDec 27, 2003

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.