US1791542A - Electromagnetic acoustic device - Google Patents

Electromagnetic acoustic device Download PDF

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Publication number
US1791542A
US1791542A US158134A US15813426A US1791542A US 1791542 A US1791542 A US 1791542A US 158134 A US158134 A US 158134A US 15813426 A US15813426 A US 15813426A US 1791542 A US1791542 A US 1791542A
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US
United States
Prior art keywords
acoustic device
electromagnetic acoustic
electromagnetic
acoustic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US158134A
Inventor
Adolph A Thomas
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Individual
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Individual
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Publication date
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Priority to US158134A priority Critical patent/US1791542A/en
Application granted granted Critical
Publication of US1791542A publication Critical patent/US1791542A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
US158134A 1926-12-31 1926-12-31 Electromagnetic acoustic device Expired - Lifetime US1791542A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US158134A US1791542A (en) 1926-12-31 1926-12-31 Electromagnetic acoustic device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US158134A US1791542A (en) 1926-12-31 1926-12-31 Electromagnetic acoustic device

Publications (1)

Publication Number Publication Date
US1791542A true US1791542A (en) 1931-02-10

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Family Applications (1)

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US158134A Expired - Lifetime US1791542A (en) 1926-12-31 1926-12-31 Electromagnetic acoustic device

Country Status (1)

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US (1) US1791542A (en)

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