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. 16, 1999
Filed:
Oct. 15, 1996
Roger A Edens, Oconomowoc, WI (US);
Ronald L Hueneke, Greendale, WI (US);
Escalon Medical Corporation, Skillman, NJ (US);
Abstract
A cool white light source includes a reflectorized lamp which outputs light having a correlated color temperature of about 5830.degree. K., a first ultraviolet (UV) filter and a second infrared (IR) filter. The lamp reflector also acts as an initial IR filter and initially filters out about 80 percent or more of the infrared radiation spectrum of the lamp generated light before the lamp generated light is passed through the first UV filter and the second IR filter. The second IR filter has an effective filtration of about 90 percent at least above about 760 nm, suggestedly above about 720 nm and most desirably above about 700 nm. The UV filter has an effective UV reflectance of over 99 percent at least below about 375 nm and suggestedly below about 400 nm and desirably below about 420 nm. Since filtration occurs at the margins of the visible light spectrum, a high correlated color temperature is maintained, such that a balanced white light having a color temperature over 5000.degree. K. is delivered.