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Novel photographic products and processes for color diffusion transfer utilizing silver halide emulsions with specific proportions of average halide grain size

US 3,697,271 A · Inventors: TIMSON WILLIAM J

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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 10, 1972. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by October 10, 1989.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledApril 16, 1971
GrantedOctober 10, 1972
Term endedOctober 10, 1989
Application number—
Classification (CPC)G03C8/02
Length25 pages

Timeline

Timeline From USPTO dates

197219741976197819801982198419861988Application filedApril 16, 1971Patent grantedOct 10, 1972Term endedOct 10, 1989

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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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