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Expired European patentEurope

Method of cleaning reflector mirror in optical dew point meter and an optical dew point meter equipped with a cleaning device

EP 0535252 B1 · Applicant: OSAKA SANSO KOGYO LIMITED

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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 17, 1992 and granted July 2, 1997. A European patent lasts at most 20 years from filing, so its term ended April 17, 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 October 17, 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.
FiledApril 17, 1992
PublishedApril 7, 1993
GrantedJuly 2, 1997
Term endedApril 17, 2012
Application numberEP 92908747
Classification (CPC)B08B7/0064 +1 more

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedApril 17, 1992PublishedApril 7, 1993Patent grantedJuly 2, 1997Term endedApril 17, 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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