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Expired European patentEurope

Hydantoin derivatives for use in inhibiting aldose reductase activity, compositions therefor and process for preparing spiro-fluoren compounds

EP 0092385 B1 · Applicant: ALCON LABORATORIES, INC.

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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 April 14, 1983 and granted June 12, 1991. A European patent lasts at most 20 years from filing, so its term ended April 14, 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 October 14, 2008.
  • 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.
FiledApril 14, 1983
PublishedOctober 26, 1983
GrantedJune 12, 1991
Term endedApril 14, 2003
Application numberEP 83302111
Classification (CPC)C07D235/02

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedApril 14, 1983PublishedOct 26, 1983Patent grantedJune 12, 1991Term endedApril 14, 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

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