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Composite radiopanel and sound modifier

US 1,652,257 A · Inventors: STEVENSON WILLIAM B

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2 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 December 13, 1927. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by December 13, 1944.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledAugust 20, 1925
GrantedDecember 13, 1927
Term endedDecember 13, 1944
Application number—
Classification (CPC)H04R1/021
Length6 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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