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Process of dyeing with basic dyestuffs involving the use of aryl derivatives of amides of aromatic hydroxycarboxylic acids as mordants

US 1,663,451 A · Inventors: ALFRED GUENTHER et al.

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Why it's free to use

  • Granted March 20, 1928. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by March 20, 1945.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledJanuary 29, 1926
GrantedMarch 20, 1928
Term endedMarch 20, 1945
Application number—
Classification (CPC)D06P1/6495 +2 more
Length2 pages

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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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