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Continuous process for the refining of mineral oils

US 1,661,826 A · Inventors: TH HESSLE ERIC

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Listed from its USPTO record in Patent Yard's full-term archive. Its claims, description and drawings are in the USPTO PDF and on Google Patents, and the Claude kit works from them.

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Why it's free to use

  • Granted March 6, 1928. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by March 6, 1945.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledDecember 6, 1923
GrantedMarch 6, 1928
Term endedMarch 6, 1945
Application number—
Classification (CPC)C10G9/40
Length5 pages

Timeline

Timeline From USPTO dates

19241927193019331936193919421945Application filedDec 6, 1923Patent grantedMarch 6, 1928Term endedMarch 6, 1945

Sources & verification

Official USPTO records

Full published documentText and every drawing sheet as a PDF.USPTOFile historyStatus, office actions, notices, fee records and petitions.USPTO Patent CenterPatent Public Search recordSearchable full text and bibliographic data.USPTO

Cross-check elsewhere

Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.comJustia PatentsFull text, claims and classification.patents.justia.comFreePatentsOnlineFull text and PDF.freepatentsonline.comEspacenetForeign family and legal status.European Patent Office

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