Expired European patentEurope
Interference sensors and methods of measuring a physical quantity using such interference sensors as well as vehicle control system
EP 0444843 B1 · Applicant: HITACHI, LTD.
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 February 25, 1991 and granted October 9, 1996. A European patent lasts at most 20 years from filing, so its term ended February 25, 2011.
- 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 August 25, 2016.
- 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.
FiledFebruary 25, 1991
PublishedSeptember 4, 1991
GrantedOctober 9, 1996
Term endedFebruary 25, 2011
Application numberEP 91301479
Classification (CPC)G01C19/72
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.