Patent Yard Sign in
Expired, full termArchiveSolo inventor

Forming a relief by developing and hardening an exposed unhardened silver halide emulsion in the exposed areas with 3-pyrazolidones having hydroxymethyl substitution in the 4-position

US 3,453,109 A · Inventors: LEE WILLIAM E

USPTO PDF

Overview

The published document from the USPTO: abstract, claims, description and drawings. Open it full size

Read the whole patent

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.

Google PatentsUSPTO PDF

Why it's free to use

  • Granted July 1, 1969. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by July 1, 1986.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledJune 24, 1966
GrantedJuly 1, 1969
Term endedJuly 1, 1986
Application number—
Classification (CPC)G03C5/315
Length4 pages

Timeline

Timeline From USPTO dates

1967196919711973197519771979198119831985Application filedJune 24, 1966Patent grantedJuly 1, 1969Term endedJuly 1, 1986

Sources & verification

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

Cross-check elsewhere

Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.comJustia PatentsFull text, claims and classification.patents.justia.comFreePatentsOnlineFull text and PDF.freepatentsonline.comEspacenetForeign family and legal status.European Patent Office

Everything on this page comes from the USPTO record linked above.