Expired European patentEurope
Process for increasing the life of gas-permeable refractory elements in the bottoms of metallurgical vessels, especially for steel-basic-oxygen furnaces
EP 0093040 B1 · Applicant: INSTITUT DE RECHERCHES DE LA SIDERURGIE FRANCAISE (IRSID)
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 April 18, 1983 and granted April 6, 1988. A European patent lasts at most 20 years from filing, so its term ended April 18, 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 October 18, 2008.
- 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.
FiledApril 18, 1983
PublishedNovember 2, 1983
GrantedApril 6, 1988
Term endedApril 18, 2003
Application numberEP 83400766
Classification (CPC)C21C7/0087 +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.