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Method for reducing deposition of cokes in heat refining process of petroleum high molecular hydrocarbons and additive used in the method

EP 0816475 A2 · Applicant: NIPPON SHOKUBAI CO., LTD.

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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 June 30, 1997 and never granted as a European patent. Had it been granted, its 20-year term would have ended June 30, 2017.
  • 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 December 30, 2022.
  • 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.
FiledJune 30, 1997
PublishedJanuary 7, 1998
GrantedNever granted
Term endedJune 30, 2017
Application numberEP 97110655
Classification (CPC)C10G75/04

Timeline

Timeline From EPO dates

1998200020022004200620082010201220142016Application filedJune 30, 1997PublishedJan 7, 1998Term endedJune 30, 2017

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

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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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