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Expired European patentEurope

Apparatus and method to communicate bidirectional information in a borehole

EP 0194792 B1 · Applicant: APPLIED TECHNOLOGIES ASSOCIATES

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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 3, 1986 and granted January 18, 1995. A European patent lasts at most 20 years from filing, so its term ended March 3, 2006.
  • 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 3, 2011.
  • 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 3, 1986
PublishedSeptember 17, 1986
GrantedJanuary 18, 1995
Term endedMarch 3, 2006
Application numberEP 86301487
Classification (CPC)E21B47/13

Timeline

Timeline From EPO dates

1987198919911993199519971999200120032005Application filedMarch 3, 1986PublishedSep 17, 1986Patent grantedJan 18, 1995Term endedMarch 3, 2006

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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