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Ear muff hearing aid
   
Document Number
US Patent 4574912
Issued Date
March 11, 1986
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Abstract
An acoustic device for amplifying sound is provided and consists of a pair of ear extenders secured to a head band so that the head band may be positioned on a listener's head with the ear extenders transversely in contact with the listener's head behind the ears whereby sounds are amplified and transmitted into the ears.
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Ear muff hearing aid - US Patent 4574912 Drawing
Drawing from US Patent 4574912
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Number of Claims:
6
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Owner
Published
March 11, 1986
Application Number
06/671,207
Filed
November 14, 1984
US Classification
181/129   181/136
Int'l Classification
A61F   11/00   (20060101)   H04R   25/02   (20060101)  
USPTO Field of Search
181/129   181/133   181/136  
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Description
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