Patents by Inventor Takeshi Nakato

Takeshi Nakato has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for producing 1H-3-aminopyrrolidine and derivatives thereof
    Patent number: 6531594
    Abstract: A process for producing 1H-3-aminopyrrolidine and derivatives thereof is disclosed.
    Type: Grant
    Filed: August 21, 2001
    Date of Patent: March 11, 2003
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Michi Watanabe, Takeshi Nakato, Jun Takehara, Kazuaki Kanno, Shuji Ichikawa
  • Process for producing 1H-3-aminopyrrolidine and derivatives thereof
    Publication number: 20020042523
    Abstract: A process for producing 1H-3-aminopyrrolidine and derivatives thereof is disclosed.
    Type: Application
    Filed: August 21, 2001
    Publication date: April 11, 2002
    Applicant: Mitsubishi Chemical Corporation
    Inventors: Michi Watanabe, Takeshi Nakato, Jun Takehara, Kazuaki Kanno, Syuji Ichikawa
  • Aspartic acid copolymer and process for producing the same
    Patent number: 5854378
    Abstract: This invention an aspartic acid copolymer obtained by copolymerizing a monomer mixture comprising (1) aspartic acid, maleamic acid and/or a reaction product of maleic acid and ammonia as a main monomer, (2) fumaric acid, and (3) succinic acid and containing 0.005 to 3% by weight, based on the total monomers, of ammonia in the form of an ammonium salt and hydrolyzing the resulting copolymer partially or completely; and a process for producing the same.
    Type: Grant
    Filed: December 12, 1996
    Date of Patent: December 29, 1998
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Masayuki Tomida, Masako Yoshikawa, Takeshi Nakato
  • Non-crystalline ether-imide type high purity bismaleimide composition and process for producing the same
    Patent number: 5371236
    Abstract: A non-crystalline ether-imide type high purity bismaleimide composition represented by formula (I): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4 each represent a hydrogen atom, a halogen atom, or an alkyl group having from 1 to 4 carbon atoms; R.sup.5 represents a hydrogen atom or a methyl group; and R.sup.6 represents a hydrogen atom, a methyl group or a phenyl group. The non-crystalline bismaleimide (I) has a purity of 95 wt % or higher, a melting point of not higher than 130.degree. C., and exhibits excellent solubility in a solvent.
    Type: Grant
    Filed: June 18, 1993
    Date of Patent: December 6, 1994
    Assignee: Mitsubishi Petrochemical Co., Ltd.
    Inventors: Kaoru Kanayama, Tadao Takeyama, Takeshi Nakato, Yoshinobu Ohnuma, Hiromi Chiba