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Expired European patentEurope

Electro-optical differential voltage method and apparatus in a measuring system for phase shifted signals

EP 0361832 B1 · Applicant: ASEA BROWN BOVERI INC. (a Delaware corporation)

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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 September 25, 1989 and granted June 7, 1995. A European patent lasts at most 20 years from filing, so its term ended September 25, 2009.
  • 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 March 25, 2015.
  • 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.
FiledSeptember 25, 1989
PublishedApril 4, 1990
GrantedJune 7, 1995
Term endedSeptember 25, 2009
Application numberEP 89309733
Classification (CPC)G01R15/247 +1 more

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedSep 25, 1989PublishedApril 4, 1990Patent grantedJune 7, 1995Term endedSep 25, 2009

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

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