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Expired European patentEurope

Process for improving the pliability of hardened copper tubes by dynamic thermal treatment

EP 0481902 B1 · Applicant: TREFIMETAUX

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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 October 16, 1991 and granted November 29, 1995. A European patent lasts at most 20 years from filing, so its term ended October 16, 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 April 16, 2017.
  • 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.
FiledOctober 16, 1991
PublishedApril 22, 1992
GrantedNovember 29, 1995
Term endedOctober 16, 2011
Application numberEP 91420365
Classification (CPC)C22F1/08

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedOct 16, 1991PublishedApril 22, 1992Patent grantedNov 29, 1995Term endedOct 16, 2011

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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