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Expired European patentEurope

Apparatus for observing sound field of ultrasonic wave

EP 0136857 B1 · Applicant: FUJITSU LIMITED

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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 September 13, 1984 and granted November 17, 1988. A European patent lasts at most 20 years from filing, so its term ended September 13, 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 March 13, 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.
FiledSeptember 13, 1984
PublishedApril 10, 1985
GrantedNovember 17, 1988
Term endedSeptember 13, 2004
Application numberEP 84306257
Classification (CPC)G01S7/52038 +1 more

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedSep 13, 1984PublishedApril 10, 1985Patent grantedNov 17, 1988Term endedSep 13, 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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