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Expired European patentEurope

Method of and apparatus for measuring the transverse moments of the electromagnetic field associated with an optical beam

EP 0145936 B1 · Applicant: CSELT Centro Studi e Laboratori Telecomunicazioni S.p.A.

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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 November 7, 1984 and granted March 15, 1989. A European patent lasts at most 20 years from filing, so its term ended November 7, 2004.
  • 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 May 7, 2010.
  • 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.
FiledNovember 7, 1984
PublishedJune 26, 1985
GrantedMarch 15, 1989
Term endedNovember 7, 2004
Application numberEP 84113432
Classification (CPC)G01J9/00 +2 more

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedNov 7, 1984PublishedJune 26, 1985Patent grantedMarch 15, 1989Term endedNov 7, 2004

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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