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Expired European patentEurope

Progressive surface for a progressive lens

EP 0452802 B1 · Applicant: Firma Carl Zeiss

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.

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Why it's free to use

  • Filed April 11, 1991 and granted March 8, 1995. A European patent lasts at most 20 years from filing, so its term ended April 11, 2011.
  • 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 11, 2016.
  • 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 11, 1991
PublishedOctober 23, 1991
GrantedMarch 8, 1995
Term endedApril 11, 2011
Application numberEP 91105734
Classification (CPC)G02C7/061 +2 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedApril 11, 1991PublishedOct 23, 1991Patent grantedMarch 8, 1995Term endedApril 11, 2011

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.