Patent Yard Sign in
Expired European patentEurope

Adducts of diaminodiphenyl sulfone compounds as hardeners for epoxy resins

EP 0539331 B1 · Applicant: CIBA-GEIGY AG

EPO PDF

Overview

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

Read the whole patent

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.

Google PatentsEPO PDF

Why it's free to use

  • Filed October 16, 1992 and granted June 5, 1996. A European patent lasts at most 20 years from filing, so its term ended October 16, 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 April 16, 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.
FiledOctober 16, 1992
PublishedApril 28, 1993
GrantedJune 5, 1996
Term endedOctober 16, 2012
Application numberEP 92810797
Classification (CPC)C08G59/184

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedOct 16, 1992PublishedApril 28, 1993Patent grantedJune 5, 1996Term endedOct 16, 2012

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.