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.

Date of Patent:
Dec. 18, 2012

Filed:

Mar. 11, 2009
Applicants:

Masateru Ito, Kamakura, JP;

Izumi Nakagawa, Kamakura, JP;

Koya Kato, Nagoya, JP;

Takashi Mimitsuka, Kamakura, JP;

Kenji Sawai, Kamakura, JP;

Shin-ichi Minegishi, Otsu, JP;

Hideki Sawai, Kamakura, JP;

Katsushige Yamada, Kamakura, JP;

Inventors:

Masateru Ito, Kamakura, JP;

Izumi Nakagawa, Kamakura, JP;

Koya Kato, Nagoya, JP;

Takashi Mimitsuka, Kamakura, JP;

Kenji Sawai, Kamakura, JP;

Shin-ichi Minegishi, Otsu, JP;

Hideki Sawai, Kamakura, JP;

Katsushige Yamada, Kamakura, JP;

Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 209/84 (2006.01); C07C 209/86 (2006.01); C07C 231/02 (2006.01);
U.S. Cl.
CPC ...
Abstract

A method for producing a diamine includes purifying a diamine from an aqueous solution containing a diamine salt by adding an alkaline substance to the aqueous solution and then filtering the resulting solution by allowing the solution to pass through a nanofiltration membrane to remove the salt, thereby obtaining an aqueous diamine solution.


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