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Expired European patentEurope

Tubular joint with trapped mid-joint metal to metal seal

EP 0131621 B1 · Applicant: HYDRIL COMPANY

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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 January 13, 1984 and granted September 30, 1987. A European patent lasts at most 20 years from filing, so its term ended January 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 July 13, 2009.
  • 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.
FiledJanuary 13, 1984
PublishedJanuary 23, 1985
GrantedSeptember 30, 1987
Term endedJanuary 13, 2004
Application numberEP 84900779
Classification (CPC)E21B17/08 +2 more

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedJan 13, 1984PublishedJan 23, 1985Patent grantedSep 30, 1987Term endedJan 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.