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Electrical controlling apparatus and method

US 2,129,331 A · Inventors: EARLE LITTLEFIELD EDGAR

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1 drawing sheet

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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 September 6, 1938. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by September 6, 1955.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledMay 23, 1928
GrantedSeptember 6, 1938
Term endedSeptember 6, 1955
Application number—
Classification (CPC)G05B11/012 +1 more
Length4 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

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