Patents by Inventor Katuhiko Miyahara

Katuhiko Miyahara has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6600255
    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 (21)-like filament (20) is held in a bulb (11) by upholding parts (30, 30′) with an axis of the coil (21) being oriented in a vertical direction, and a coil pitch of the coil (21) at the upper part thereof is made narrow as compared with that of the lower part of the filament (20). Or the filament (20) of the incandescent lamp (10) is constituted by the coil (21) of a conical shape or that of a frustum of a circular cone, and the filament is arranged within the bulb (11) in such a way that it may be held by upholding parts (30, 30′) with an axis of the coil (21) of the filament (20) being oriented in a vertical direction and the one end of the oil (21) having a smaller diameter being positioned upward.
    Type: Grant
    Filed: January 22, 2001
    Date of Patent: July 29, 2003
    Assignee: Ushiodenki Kabushiki Kaisha
    Inventors: Kenzo Kai, Minoru Asao, Katuhiko Miyahara, Hiroshi Sugahara