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Expired European patentEurope

Composition for the controlled release of an active substance and process for its preparation

EP 0016652 B1 · Applicant: NATIONAL RESEARCH DEVELOPMENT CORPORATION

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Overview

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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 March 21, 1980 and granted August 21, 1985. A European patent lasts at most 20 years from filing, so its term ended March 21, 2000.
  • 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 September 21, 2005.
  • 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.
FiledMarch 21, 1980
PublishedOctober 1, 1980
GrantedAugust 21, 1985
Term endedMarch 21, 2000
Application numberEP 80300900
Classification (CPC)A61K31/557 +2 more

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedMarch 21, 1980PublishedOct 1, 1980Patent grantedAug 21, 1985Term endedMarch 21, 2000

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.