Patents by Inventor Katsuji Ujita

Katsuji Ujita 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).

  • Processes for preparation of cyclopropylethanol, cyclo-propylacetonitrile and intermediates of both
    Publication number: 20050020846
    Abstract: A process for preparation of cyclopropylethanol, which comprises subjecting a 3-cyclopropyl-2,3-epoxypropionic acid ester to solvolysis, treating the product of the solvolysis with an acid to obtain cyclopropylacetaldehyde, and reducing the obtained cyclopropylacetaldehyde; and a process for preparation of cyclopropylacetonitrile, which comprises subjecting a 3-cyclopropyl-2,3-epoxypropionic acid ester to solvolysis in the presence of a base, treating the product of the solvolysis with an acid to obtain cyclopropylacetaldehyde, reacting the obtained cyclopropylacetaldehyde with hydroxylamine or salts thereof to obtain cyclopropaneacetaldehyde oxime, and reacting the obtained cyclopropaneacetaldehyde oxime with acetic anhydride. According to the present invention, cyclopropylethanol and cyclopropylacetonitrile can be prepared at low costs and industrially advantageously.
    Type: Application
    Filed: October 31, 2002
    Publication date: January 27, 2005
    Inventor: Katsuji Ujita
  • Process for the production of 5-oxy-7-oxabicyclo [4.1.0] hept-3-ene-3-carboxylic acid esters
    Patent number: 6797832
    Abstract: The present invention provides a method of producing 5-oxy-7-oxabicyclo[4.1.0]hept-3-ene-3-carboxylic acid ester economically, industrially advantageously and efficiently in a large amount. The present invention is a method of producing 5-oxy-7-oxabicyclo[4.1.0]hept-3-ene-3-carboxylic acid ester (X), which is shown in the following scheme. wherein each symbol is as defined in the specification.
    Type: Grant
    Filed: June 21, 2002
    Date of Patent: September 28, 2004
    Assignees: Sagami Chemical Research Center, Kuraray Co., Ltd.
    Inventors: Shiro Terashima, Katsuji Ujita, Tomoya Kuwayama, Takashi Sugioka, Kazuya Shimizu, Koichi Kanehira
  • Process for the preparation of 7-azabicyclo[4.1.0]hept-3-ene-3-carboxylic acid esters
    Patent number: 6790964
    Abstract: The present invention provides a method of producing 7-azabicyclo[4.1.0]hept-3-ene-3-carboxylic acid ester (VII) economically, industrially advantageously and efficiently in a large amount.
    Type: Grant
    Filed: August 13, 2002
    Date of Patent: September 14, 2004
    Assignees: Sagami Chemical Research Center, Kuraray Co., Ltd.
    Inventors: Shiro Terashima, Katsuji Ujita, Akihiro Ishiwata
  • Process for preparation of 7-oxabicyclo[2.2.1]hept-5-ene-2-carboxylic acid derivatives
    Patent number: 6677464
    Abstract: The present invention provides a method of industrially advantageously producing 7-oxabicyclo[2.2.1]hept-5-ene-2-carboxylic acid derivatives under mild conditions in a high yield. The present invention relates to a production method of a 7-oxabicyclo[2.2.1]hept-5-ene-2-carboxylic acid derivative of the formula (III) or the formula (IV), which comprises reacting an &agr;,&bgr;-unsaturated carboxylic acid of the formula (I) with a furan derivative of the formula (II) in the presence of a Lewis acid: wherein each symbol is as defined in the specification.
    Type: Grant
    Filed: March 14, 2003
    Date of Patent: January 13, 2004
    Assignees: Kuraray Co., Ltd., Sagami Chemical Research Center
    Inventors: Tomoya Kuwayama, Katsuji Ujita, Kazuya Shimizu, Shiro Terashima
  • PROCESS FOR PREPARATION OF 7-OXABICYCLO[2.2.1]HEPT-5-ENE-2-CARBOXYLIC ACID DERIVATIVES
    Publication number: 20030187282
    Abstract: The present invention provides a method of industrially advantageously producing 7-oxabicyclo[2.2.1]hept-5-ene-2-carboxylic acid derivatives under mild conditions in a high yield. The present invention relates to a production method of a 7-oxabicyclo[2.2.
    Type: Application
    Filed: March 14, 2003
    Publication date: October 2, 2003
    Inventors: Tomoya Kuwayama, Katsuji Ujita, Kazuya Shimizu, Shiro Terashima
  • Process for producing 2,4-dihydroxyacetophenone
    Patent number: 5621146
    Abstract: A process for producing 2,4-dihydroxyacetophenone is provided wherein resorcinol and acetic acid are reacted in the presence of a proton acid catalyst while removing formed water.
    Type: Grant
    Filed: December 7, 1995
    Date of Patent: April 15, 1997
    Assignee: Kuraray Co., Ltd.
    Inventors: Takashi Fukumoto, Katsuji Ujita, Toshiki Mori, Kozo Nakao, Yoshin Tamai