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Expired European patentEurope

Modulating pressure-actuated servo-overpressure valve

EP 0139149 B1 · Applicant: DRESSER INDUSTRIES INC.

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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 August 17, 1984 and granted June 13, 1990. A European patent lasts at most 20 years from filing, so its term ended August 17, 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 February 17, 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.
FiledAugust 17, 1984
PublishedMay 2, 1985
GrantedJune 13, 1990
Term endedAugust 17, 2004
Application numberEP 84109835
Classification (CPC)F16K31/124 +1 more

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedAug 17, 1984PublishedMay 2, 1985Patent grantedJune 13, 1990Term endedAug 17, 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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