Patents by Inventor Yasuyoshi Nakamura

Yasuyoshi Nakamura 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).

  • Patent number: 4122089
    Abstract: A compound capable of forming a color on contact with an electron accepting compound and useful as a chromogenic material for recording members represented by the general formula (I) ##STR1## wherein A represents an oxygen atom or a group capable of forming a lactam ring with benzen ring D; Y represents a hydrogen atom or a functional group (such as a halogen atom or a nitro group); and when A is an oxygen atom, R represents an amino, i.e., unsubstituted, group or a substituted amino group; R.sub.1 and R.sub.3, which may be the same or different, each represents a hydrogen atom, a lower alkyl group, a nitro group, an amino group, or a substituted amino group; and R.sub.2 represents a hydrogen atom or a lower alkyl group; wherein R.sub.1 and R.sub.2 or R.sub.2 and R.sub.3 may combine with benzene ring C to form a nitrogen-containing heterocyclic ring condensed therewith; and when A is a group capable of forming a lactam ring with benzene ring D, R represents ##STR2## R.sub.2 represents ##STR3## R.sub.4 ', R.
    Type: Grant
    Filed: February 23, 1977
    Date of Patent: October 24, 1978
    Assignee: Sankio Chemical Co., Ltd.
    Inventors: Shiro Kimura, Yasuyoshi Nakamura, Shigeki Kurimoto, Katuhiro Motouchi
  • Patent number: 4009205
    Abstract: A process for the preparation of 4-amino-3-methyl-N-substituted or unsubstituted alkylanilines comprising acylating and/or sulfonylating 4-amino-3-methyl-nitro-benzene having the formula (I) ##STR1## with an acylation or sulfonylation agent to obtain a compound having the general formula (II) ##STR2## wherein R.sub.1 represents a hydrogen atom or an acyl group, R.sub.2 represents an acyl group or a sulfonyl group, or R.sub.1 and R.sub.2 can combine as a difunctional acyl group; reducing the nitro group of the compound having the general formula (II) with hydrogen in the presence of a metal hydrogenation catalyst to obtain a compound having the general formula (III) ##STR3## wherein R.sub.1 and R.sub.2 are as above defined; alkylating the amino group of the compound having the general formula (III) with an alkylation agent selected from the group consisting of an alkyl halide, a substituted alkyl halide and an alkylene oxide to obtain a compound having the general formula (IV) ##STR4## wherein R.sub.1 and R.
    Type: Grant
    Filed: October 10, 1974
    Date of Patent: February 22, 1977
    Assignee: Sanko Chemical Company Ltd.
    Inventors: Shiro Kimura, Hideo Nagasawa, Yasuo Kato, Yasuyoshi Nakamura, Shoji Miki, Yumiko Ishikawa
  • Patent number: D398629
    Type: Grant
    Filed: December 2, 1996
    Date of Patent: September 22, 1998
    Assignee: King Jim Co., Ltd.
    Inventors: Yasuyoshi Nakamura, Hiroko Niiyama, Kenji Watanabe, Takanobu Kameda, Tomoyuki Shimmura