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Expired European patentEurope

Etchant for chemical milling a high tungsten content superalloy and process

EP 0049678 B1 · Applicant: UNITED TECHNOLOGIES CORPORATION

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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.

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Why it's free to use

  • Filed September 23, 1981 and granted September 12, 1984. A European patent lasts at most 20 years from filing, so its term ended September 23, 2001.
  • 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 23, 2007.
  • 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 23, 1981
PublishedApril 14, 1982
GrantedSeptember 12, 1984
Term endedSeptember 23, 2001
Application numberEP 81630056
Classification (CPC)C23F1/28

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedSep 23, 1981PublishedApril 14, 1982Patent grantedSep 12, 1984Term endedSep 23, 2001

Sources & verification

Official EPO records

Full published documentClaims, description and drawings as a PDF.EPOEuropean Patent RegisterProcedure, status, file inspection and legal events.EPOLinked open EP data recordThe bibliographic record this page is built from.EPO

Cross-check elsewhere

Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.comEspacenetNational family members and their legal status.European Patent Office

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