Expired European patentEurope
Stainless non-magnetic steel with high manganese and chromium content, resistant to stress corrosion and useful for drilling equipment, also the process for manufacturing rods from this steel
EP 0577898 B1 · Applicant: Aubert & Duval Société anonyme dite:
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 July 7, 1992 and granted April 8, 1998. A European patent lasts at most 20 years from filing, so its term ended July 7, 2012.
- 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 January 7, 2018.
- 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.
FiledJuly 7, 1992
PublishedJanuary 12, 1994
GrantedApril 8, 1998
Term endedJuly 7, 2012
Application numberEP 92401946
Classification (CPC)C22C38/38 +1 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.