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:
Feb. 17, 1998
Filed:
Mar. 29, 1996
Hiroyoshi Takanishi, Kanagawa-ken, JP;
Kazunari Fukue, Kanagawa-ken, JP;
Tsutomu Watanabe, Kanagawa-ken, JP;
Hiroshi Kamata, Kanagawa-ken, JP;
Akira Kawakatsu, Kanagawa-ken, JP;
Toshiba Lighting Technology Corporation, Tokyo, JP;
Abstract
An incandescent lamp has an envelope including a cylindrical portion and two hemispherical portions. Each hemispherical portion includes a second order curve which has a focus and is connected at one end of the cylindrical portion, respectively. A filament is provided along the central axis of the envelope and is located within and extends beyond a space surrounded by the cylindrical portion. An optical interference layer is arranged on a surface of the envelope to reflect infrared rays and transmit visible rays.