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Expired European patentEurope

PROCESS FOR CLEANING PRECISION OPTICS OR OPTICAL ASSEMBLIES WITHOUT PRODUCING EMISSIONS, ESPECIALLY CFCs

EP 0543961 B1 · Applicant: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.

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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 May 30, 1992 and granted September 18, 1996. A European patent lasts at most 20 years from filing, so its term ended May 30, 2012.
  • 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 30, 2017.
  • 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 30, 1992
PublishedJune 2, 1993
GrantedSeptember 18, 1996
Term endedMay 30, 2012
Application numberEP 92910464
Classification (CPC)C03C23/0075

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedMay 30, 1992PublishedJune 2, 1993Patent grantedSep 18, 1996Term endedMay 30, 2012

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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