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:
Sep. 18, 2001
Filed:
Sep. 08, 2000
Applicant:
Inventor:
Yen-Chen Chan, Taipei Hsien, TW;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F 1/510 ; H01F 2/730 ;
U.S. Cl.
CPC ...
H01F 1/510 ; H01F 2/730 ;
Abstract
A coil assembly for effectively raising output power of a speaker comprises a double-wall structure composed of an inner and an outer tubular wall, wherein a bottom end of the inner tubular wall is bent outwardly into a flat rim for stopping the outer tubular wall when the same is collared onto the inner tubular wall, and a choking slit is split longitudinally in the outer tubular wall to permit winding two or more layers of coil.