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Geochemical exploration method

US 2,742,575 A · Inventors: BRAY ELLIS E

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3 drawing sheets

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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 April 17, 1956. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by April 17, 1973.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledJuly 14, 1952
GrantedApril 17, 1956
Term endedApril 17, 1973
Application number—
Classification (CPC)G01V9/007
Length8 pages

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

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