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:
Mar. 24, 1987
Filed:
Jun. 03, 1985
Applicant:
Inventors:
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01K / ;
U.S. Cl.
CPC ...
313112 ; 313315 ;
Abstract
This invention relates to an incandescent lamp bulb comprising a visible light transmitting and infrared ray reflecting film formed on at least either one of the inside and outside of a tubular, transparent bulb, said film being composed of a lamination of alternate high and low refractive index layers, wherein the optical film thickness of any one of the high reflective index layers ranges from 0.21 to 0.31.mu., that of the topmost low refractive index layer ranges from 1/2.times.0.21 to 1/2.times.0.31.mu., that of at least one low refractive index layer ranges from 2.times.0.21 to 2.times.0.31.mu., and that of any remainder low refractive index layer ranges from 0.21 to 0.31.mu..