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Apparatus for and method of cultivating and improving the hearing

US 1,806,357 A · Inventors: MACDONALD JOEL W

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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 May 19, 1931. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by May 19, 1948.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledJune 17, 1929
GrantedMay 19, 1931
Term endedMay 19, 1948
Application number—
Classification (CPC)H04R25/606
Length4 pages

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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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