Expired European patentEurope
Measuring apparatus for determining a quantity correlated with the Wobbe index of a gas or gas mixture and method for maintaining the Wobbe index of gas mixtures constant
EP 0008151 B1 · Applicant: N.V. NEDERLANDSE GASUNIE
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.
Why it's free to use
- Filed August 16, 1979 and granted September 22, 1982. A European patent lasts at most 20 years from filing, so its term ended August 16, 1999.
- 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 16, 2005.
- 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 16, 1979
PublishedFebruary 20, 1980
GrantedSeptember 22, 1982
Term endedAugust 16, 1999
Application numberEP 79200458
Classification (CPC)G01N33/225
Timeline
Timeline From EPO dates
Sources & verification
Official EPO records
Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.