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HEARING AID WITH CHANGEABLE BATTERY COVER CONTAINING RF PICKUP COIL

  • US 3,668,334 A
  • Filed: 05/07/1970
  • Issued: 06/06/1972
  • Est. Priority Date: 05/07/1970
  • Status: Expired due to Term
First Claim
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1. A hearing aid for the hard of hearing comprising a case, a hearing aid amplifier circuit in the case adapted to be connected with a receiver, a microphone connected with the circuit, a pair of spaced electric contacts projecting from the case and connected in said circuit, said contacts being positioned to hold a battery between them outside of the case, a removable housing with an open inner end normally fitting over said contacts to conceal them and any battery between them, a radio-frequency pickup coil mounted in the outer end of said housing, a radiofrequency detection circuit in the outer end of the housing connected with the coil and provided with a pair of terminals, and conductor means connected in said amplifier circuit and projecting from the case into the housing and detachably engaging said terminals to connect said circuits, whereby a coil tuned to a different radio-frequency can be connected with said amplifier circuit by simply replacing said housing with a similar one containing such a coil.

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