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Expired European patentEurope

Seismic pulse generation

EP 0393880 B1 · Applicant: British Gas plc

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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 April 5, 1990 and granted July 28, 1993. A European patent lasts at most 20 years from filing, so its term ended April 5, 2010.
  • 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 October 5, 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.
FiledApril 5, 1990
PublishedOctober 24, 1990
GrantedJuly 28, 1993
Term endedApril 5, 2010
Application numberEP 90303644
Classification (CPC)G01V1/137

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedApril 5, 1990PublishedOct 24, 1990Patent grantedJuly 28, 1993Term endedApril 5, 2010

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.