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:
Jul. 29, 2003
Filed:
Jan. 22, 2001
Kenzo Kai, Himeji, JP;
Minoru Asao, Tatsuno, JP;
Katuhiko Miyahara, Himeji, JP;
Hiroshi Sugahara, Himeji, JP;
Ushiodenki Kabushiki Kaisha, Tokyo, JP;
Abstract
In order to provide an incandescent lamp in which an unlit state of the lamp caused by a hang-out of the coil as well as a short lifetime thereof are prevented using a simple construction and its lifetime in practical application is long, a coil ( )-like filament ( ) is held in a bulb ( ) by upholding parts ( ′) with an axis of the coil ( ) being oriented in a vertical direction, and a coil pitch of the coil ( ) at the upper part thereof is made narrow as compared with that of the lower part of the filament ( ). Or the filament ( ) of the incandescent lamp ( ) is constituted by the coil ( ) of a conical shape or that of a frustum of a circular cone, and the filament is arranged within the bulb ( ) in such a way that it may be held by upholding parts ( ′) with an axis of the coil ( ) of the filament ( ) being oriented in a vertical direction and the one end of the oil ( ) having a smaller diameter being positioned upward.