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Method of making layers sensitive to light

US 2,223,909 A · Inventors: RAGNAR ELVEGARD EVERT

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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 December 3, 1940. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by December 3, 1957.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledMarch 16, 1938
GrantedDecember 3, 1940
Term endedDecember 3, 1957
Application number—
Classification (CPC)G03C1/496
Length3 pages

Timeline

Timeline From USPTO dates

1939194119431945194719491951195319551957Application filedMarch 16, 1938Patent grantedDec 3, 1940Term endedDec 3, 1957

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

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