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Expired European patentEurope

Leak detector of the gas tracer type having a device for measuring and indicating the leak rate Q

EP 0103771 B1 · Applicant: ALCATEL CIT

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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 23, 1983 and granted September 9, 1987. A European patent lasts at most 20 years from filing, so its term ended August 23, 2003.
  • 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 23, 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.
FiledAugust 23, 1983
PublishedMarch 28, 1984
GrantedSeptember 9, 1987
Term endedAugust 23, 2003
Application numberEP 83108295
Classification (CPC)G01D13/10 +1 more

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedAug 23, 1983PublishedMarch 28, 1984Patent grantedSep 9, 1987Term endedAug 23, 2003

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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