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. 15, 2008
Filed:
Nov. 22, 2001
Applicants:
Tsuyoshi Tominaga, Otsu, JP;
Daisuke Kitazawa, Otsu, JP;
Aki Makiyama, Otsu, JP;
Akira Kohama, Otsu, JP;
Inventors:
Tsuyoshi Tominaga, Otsu, JP;
Daisuke Kitazawa, Otsu, JP;
Aki Makiyama, Otsu, JP;
Akira Kohama, Otsu, JP;
Assignee:
Toray Industries, Inc., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J 1/62 (2006.01); C07F 9/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A light emitting device includes an emissive substance between an anode and cathode that emits light upon application of electrical energy. The emissive substance included in the device is at least one of the following types of compounds: (a) a compound having a plurality of 1,7-phenanthroline skeletal structures; (b) a benzoquinoline derivative; (c) a spiro compound; and (d) a tetraphenylmethane derivative.