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Expired European patentEurope

Nondestructive downhole seismic vibrator source and processes of utilizing the vibrator to obtain information about geologic formations

EP 0263149 B1 · Applicant: CHEVRON RESEARCH AND TECHNOLOGY COMPANY

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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 March 18, 1987 and granted December 11, 1991. A European patent lasts at most 20 years from filing, so its term ended March 18, 2007.
  • 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 September 18, 2012.
  • 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.
FiledMarch 18, 1987
PublishedApril 13, 1988
GrantedDecember 11, 1991
Term endedMarch 18, 2007
Application numberEP 87902290
Classification (CPC)G01V1/42 +2 more

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedMarch 18, 1987PublishedApril 13, 1988Patent grantedDec 11, 1991Term endedMarch 18, 2007

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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