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Diazotype developer composition containing a potassium borate and process of using same

US 2,657,141 A · Inventors: HUBERTUS KESSELS FRANCISCUS AN

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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 October 27, 1953. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by October 27, 1970.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledJanuary 14, 1953
GrantedOctober 27, 1953
Term endedOctober 27, 1970
Application number—
Classification (CPC)G03C5/18
Length5 pages

Timeline

Timeline From USPTO dates

195419561958196019621964196619681970Application filedJan 14, 1953Patent grantedOct 27, 1953Term endedOct 27, 1970

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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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