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Process for production of aromatic polycarboxylic acids

US 2,880,237 A · Inventors: KNOBLOCH JAMES O

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Why it's free to use

  • Granted March 31, 1959. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by March 31, 1976.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledMay 20, 1957
GrantedMarch 31, 1959
Term endedMarch 31, 1976
Application number—
Classification (CPC)C07C51/265 +2 more
Length3 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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