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:
Aug. 15, 1978
Filed:
Oct. 28, 1977
Applicant:
Inventors:
Atsushi Suzuki, Hachioji, JP;
Jean-Pierre Jeser, Esslingen, DE;
Assignee:
Hitachi, Ltd., , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K / ;
U.S. Cl.
CPC ...
423263 ; 423306 ; 2523 / ;
Abstract
An infrared rays excited - infrared rays emitting fluorescent material which contains predetermined quantities of neodymium and ytterbium as activators is disclosed. The fluorescent material according to this invention is higher in the luminescence intensity than a conventional, infrared rays excited - infrared rays emitting fluorescent material which is activated with neodymium only. Moreover, its maximum luminescence wavelength lies within a wavelength region which a silicon photosensor can detect at high sensitivity. It is therefore very useful in practical use. The fluorescent material is represented by the following formula: