×

Earphone

  • US 4,403,120 A
  • Filed: 06/29/1981
  • Issued: 09/06/1983
  • Est. Priority Date: 06/30/1980
  • Status: Expired due to Term
First Claim
Patent Images

1. An earphone comprising a case of circular cross-section having a diameter permitting said case to be frictionally held within a human ear cavity between the tragus and an opposing projection of the pinna and a speaker unit located within said case, said case having one end having at least one sound opening adapted to extend over the auditory meatus without extending therein and said case having a diameter adjacent said one end substantially equal to the diameter of the case adjacent a middle portion thereof with the diameter of the case adjacent the other end being gradually reduced.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×