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:
Jan. 26, 1993
Filed:
Aug. 30, 1991
Applicant:
Inventors:
Muhammad A Khan, White Bear Lake, MN (US);
Jonathon N Kuznia, Bloomington, MN (US);
James M Van Hove, Eagan, MN (US);
Assignee:
APA Optics, Inc., Blaine, MN (US);
Primary Examiner:
Int. Cl.
CPC ...
G02B / ; F21V / ; H01L / ;
U.S. Cl.
CPC ...
359359 ; 252588 ; 359361 ; 359578 ; 359589 ; 257 17 ; 257 22 ; 257 21 ; 257 76 ; 257201 ;
Abstract
The invention is a filter device of at least two layers, the first layer of Al.sub.x Ga.sub.(1-x) N and the second layer of Al.sub.y Ga.sub.(1-y) N wherein x and y may have any value from 0 to 1. The invention may be used as a fixed wavelength or tunable wavelength filter or in ultraviolet detectors and laser devices, among other systems. Applications for the invention include detection of UV radiation in environments having a high level of incident infrared and visible radiation, as well as applications requiring detection of UV emission when no other radiation is present.