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Diazo presensitized lithographic plate base comprising a urea-formaldehyde intermediate layer and process for making

US 3,136,639 A · Inventors: RICHLIN ISADORE M et al.

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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 June 9, 1964. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by June 9, 1981.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledDecember 4, 1961
GrantedJune 9, 1964
Term endedJune 9, 1981
Application number—
Classification (CPC)G03F7/021 +2 more
Length5 pages

Timeline

Timeline From USPTO dates

1962196419661968197019721974197619781980Application filedDec 4, 1961Patent grantedJune 9, 1964Term endedJune 9, 1981

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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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