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Metering system for party telephone lines

US 1,504,232 A · Inventors: GOODRUM CHARLES L et al.

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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 August 12, 1924. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by August 12, 1941.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledJuly 6, 1921
GrantedAugust 12, 1924
Term endedAugust 12, 1941
Application number—
Classification (CPC)H04Q3/00
Length5 pages

Timeline

Timeline From USPTO dates

1922192419261928193019321934193619381940Application filedJuly 6, 1921Patent grantedAug 12, 1924Term endedAug 12, 1941

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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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