Expired European patentEurope
Use of the electromagnetic ultrasound transformation process in monitoring the filling level and formation of bubbles in enclosures containing a fluid
EP 0309890 B1 · Applicant: SIEMENS AKTIENGESELLSCHAFT
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 September 21, 1988 and granted January 15, 1992. A European patent lasts at most 20 years from filing, so its term ended September 21, 2008.
- 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 March 21, 2014.
- 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.
FiledSeptember 21, 1988
PublishedApril 5, 1989
GrantedJanuary 15, 1992
Term endedSeptember 21, 2008
Application numberEP 88115492
Classification (CPC)G01N29/02 +2 more
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.