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:
Apr. 07, 2009
Filed:
Dec. 10, 2002
Makoto Satsuki, Okayama, JP;
Makoto Fujiwara, Okayama, JP;
Natsuko Ishida, Okayama, JP;
Sadaharu Suga, Okayama, JP;
Hisayoshi Fujikawa, Aichi, JP;
Hisato Takeuchi, Aichi, JP;
Yasunori Taga, Aichi, JP;
Makoto Satsuki, Okayama, JP;
Makoto Fujiwara, Okayama, JP;
Natsuko Ishida, Okayama, JP;
Sadaharu Suga, Okayama, JP;
Hisayoshi Fujikawa, Aichi, JP;
Hisato Takeuchi, Aichi, JP;
Yasunori Taga, Aichi, JP;
Kabushiki Kaisha Hayashibara Seibutsu Kagaku Kenkyujo, Okayama, JP;
Abstract
A method for producing a coumarin compound represented by Formula 1, which comprises a step of reacting a coumarin compound represented by Formula 1 with a compound having an aldehyde group and an activated methylene group; luminous agents for organic EL elements and organic EL elements which all comprise the coumarin compound; and displaying panels and information displaying apparatuses using the organic EL elements:ø(Z)m  Formula 1wherein in Formula 1, ø is an aromatic ring, heterocycle, or a combination thereof, each Z is the same or a different coumarin group represented by Formula 2; and m is an integer of two or more;