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Method of preparing hydrorefining catalysts

US 3,523,913 A · Inventors: O'HARA MARK J

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Why it's free to use

  • Granted August 11, 1970. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by August 11, 1987.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledMarch 13, 1968
GrantedAugust 11, 1970
Term endedAugust 11, 1987
Application number—
Classification (CPC)C10G45/08 +1 more
Length4 pages

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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

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