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Expired European patentEurope

Substituted tetrahydrotetrazolo(5,1-a)phthalazines

EP 0099080 B1 · Applicant: THE DOW CHEMICAL 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 July 8, 1983 and granted February 3, 1988. A European patent lasts at most 20 years from filing, so its term ended July 8, 2003.
  • 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 January 8, 2009.
  • 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.
FiledJuly 8, 1983
PublishedJanuary 25, 1984
GrantedFebruary 3, 1988
Term endedJuly 8, 2003
Application numberEP 83106688
Classification (CPC)C07D487/04 +1 more

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedJuly 8, 1983PublishedJan 25, 1984Patent grantedFeb 3, 1988Term endedJuly 8, 2003

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.