The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 09, 1979
Filed:
Aug. 03, 1977
Applicant:
Inventor:
Taichiro Akiyama, Tokyo, JP;
Assignee:
Koken Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04R / ; H04R / ;
U.S. Cl.
CPC ...
1791 / ; 1791 / ; 181135 ;
Abstract
A plug-type hearing device comprising a sound-leading portion being inserted into the auditory miatus, a first envelope attached around the sound-leading portion, a second envelope being positioned at the outside of the auditory miatus and being communicated with the first envelope through a pipe, and a holding means for holding an expanded state of the first envelope when the volume of the latter is increased, wherein the volume of the second envelope is decreased to increase the volume of the first envelope by the pressure of a fluid contained inside, and the expanded first envelope is closely contacted with the wall surface of the auditory miatus.