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:
Oct. 19, 1999
Filed:
Oct. 13, 1998
Applicant:
Inventor:
Takashi Oyamada, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05K / ;
U.S. Cl.
CPC ...
361695 ; 361690 ; 361697 ; 361704 ; 257722 ; 174 161 ; 174 163 ; 165 803 ;
Abstract
A communication device for use in a base station of a portable telephone system has a radiation section including a spiral projection formed on an external surface of a casing to define a spiral air passage on the casing, a fan disposed on the casing inside a central space of the spiral passage, and a motor disposed inside the casing to drive the fan through a shaft penetrating the wall of the casing. A spiral air flow generated by the fan functions for efficient heat radiation through the casing. The spiral projection is formed by drawing the wall of the casing.