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Expired European patentEurope

Solid particles containing calcium peroxide, their preparation and their utilisation for the treatment of water

EP 0002543 B1 · Applicant: INTEROX Société Anonyme

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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 November 15, 1978 and granted October 28, 1981. A European patent lasts at most 20 years from filing, so its term ended November 15, 1998.
  • 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 May 15, 2004.
  • 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.
FiledNovember 15, 1978
PublishedJune 27, 1979
GrantedOctober 28, 1981
Term endedNovember 15, 1998
Application numberEP 78200306
Classification (CPC)C01B15/043 +1 more

Timeline

Timeline From EPO dates

1979198119831985198719891991199319951997Application filedNov 15, 1978PublishedJune 27, 1979Patent grantedOct 28, 1981Term endedNov 15, 1998

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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