Patents by Inventor Nobuki Sigemori

Nobuki Sigemori 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: 6190845
    Abstract: A process and a composition is described of a color developing agent for processing a silver halide color photographic material, the composition containing a paraphenylenediamine type color developing agent and an amine of formula (I) or a salt thereof R1NR2R3  (I) wherein R1 and R2 are independently selected from alkyls, phenyls, hydrogen, and substituted derivatives thereof, such substituents including hydroxyl, alkoxyl, amide, sulfoneaminde and alkyl sulfoneamide groups, and R3 represents an aromatic such as phenyl or naphthyl and substituents thereof. When used in highly concentrated solutions, the compositions are capable of preventing the precipitation of the color developer agent.
    Type: Grant
    Filed: September 28, 1995
    Date of Patent: February 20, 2001
    Assignee: Chugai Phote Chemical Co., LTD
    Inventor: Nobuki Sigemori
  • Patent number: 6071679
    Abstract: As it has been described above, a color developing agent composition according to the invention, which includes a compound given by Formula (I) ##STR1## wherein R.sub.1 through R.sub.6 are substituents respectively and independently are selected from the group consisting of a hydrogen atom or any substituted or unsubstituted group selected from among an alkyl group, an alkoxyl group, a hydroxyl group and an amino group, possible substitution groups for the selected group comprising a hydroxyl group, an amino group and an alkoxyl group; (2) a paraphenylene diamine type color developing agent; and (3) a compound given by Formula (II) ##STR2## wherein R.sub.7 and R.sub.8 are substituents respectively and independently selected from the group consisting of a hydrogen atom or a substituted or an unsubstituted alkyl group.
    Type: Grant
    Filed: September 1, 1998
    Date of Patent: June 6, 2000
    Inventors: Nobuki Sigemori, Masako Sekiya