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Expired European patentEurope

Heat exchanger

EP 0052422 B1 · Applicant: EXXON RESEARCH AND ENGINEERING COMPANY

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Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

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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 14, 1981 and granted November 25, 1987. A European patent lasts at most 20 years from filing, so its term ended October 14, 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 April 14, 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.
FiledOctober 14, 1981
PublishedMay 26, 1982
GrantedNovember 25, 1987
Term endedOctober 14, 2001
Application numberEP 81304782
Classification (CPC)F28D9/04 +2 more

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedOct 14, 1981PublishedMay 26, 1982Patent grantedNov 25, 1987Term endedOct 14, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.