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Expired European patentEurope

Electric field measuring apparatus

EP 0580446 B1 · Applicant: HAMAMATSU PHOTONICS K.K.

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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 July 23, 1993 and granted September 9, 1998. A European patent lasts at most 20 years from filing, so its term ended July 23, 2013.
  • 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 January 23, 2019.
  • 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.
FiledJuly 23, 1993
PublishedJanuary 26, 1994
GrantedSeptember 9, 1998
Term endedJuly 23, 2013
Application numberEP 93305824
Classification (CPC)G01R31/308 +1 more

Timeline

Timeline From EPO dates

1994199619982000200220042006200820102012Application filedJuly 23, 1993PublishedJan 26, 1994Patent grantedSep 9, 1998Term endedJuly 23, 2013

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.