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Electric signal system

US 1,742,425 A · Inventors: THOMAS THOMAS H

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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 January 7, 1930. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by January 7, 1947.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledAugust 8, 1927
GrantedJanuary 7, 1930
Term endedJanuary 7, 1947
Application number—
Classification (CPC)B61L15/0009
Length5 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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