Patent Yard Sign in
Expired European patentEurope

Process for the preparation of dry alkali metal salts of 1,8-naphthalimide

EP 0163250 B1 · Applicant: HOECHST AKTIENGESELLSCHAFT

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 May 22, 1985 and granted May 13, 1992. A European patent lasts at most 20 years from filing, so its term ended May 22, 2005.
  • 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 November 22, 2010.
  • 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.
FiledMay 22, 1985
PublishedDecember 4, 1985
GrantedMay 13, 1992
Term endedMay 22, 2005
Application numberEP 85106280
Classification (CPC)C07D221/14

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedMay 22, 1985PublishedDec 4, 1985Patent grantedMay 13, 1992Term endedMay 22, 2005

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.