Patents by Inventor Katsuji Ota

Katsuji Ota 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: 6284448
    Abstract: A silver halide light sensitive color photographic material is disclosed, comprising a support having thereon a silver halide emulsion layer, the photographic material further comprising a 2-equivalent yellow coupler exhibiting superior dye forming capability and enhanced solubility in a solvent, and represented by the following formula:
    Type: Grant
    Filed: June 27, 2000
    Date of Patent: September 4, 2001
    Assignee: Konica Corporation
    Inventors: Takatugu Suzuki, Noriko Ueda, Takayuki Suzuki, Katsuji Ota, Satoru Ikesu
  • Patent number: 6204390
    Abstract: A synthesizing method for a 3-substituted-3-oxo-2-(2,4 -oxazolidinedione-3-yl)propionic acid amide compound represented by the following Formula [I], by reacting a compound represented by the following Formula [II] with a compound represented by the following Formula [III], in the presence of an organic base;
    Type: Grant
    Filed: July 19, 1999
    Date of Patent: March 20, 2001
    Assignee: Konica Corporation
    Inventors: Satoru Ikesu, Kazuhiko Kimura, Katsuji Ota
  • Patent number: 6197493
    Abstract: A silver halide color photographic light-sensitive material is disclosed. The light-sensitive material comprises a support having thereon a blue-sensitive silver halide emulsion layer containing a yellow dye-forming coupler represented by the following Formula I; Formula I wherein R, is an aliphatic group or an aromatic group, R2 is an anti-diffusion aliphatic group or aromatic group, R3 is a hydrogen atom or halogen atom, Z3 is >N—R2, in which R2, is a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, a heterocyclic group, or —O—, Z4 is >N—R22 in which R22 is a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, a heterocyclic group, or >C(R23) (R24) in which R23 and R24 are each a hydrogen atom or a substituent.
    Type: Grant
    Filed: September 10, 1999
    Date of Patent: March 6, 2001
    Assignee: Konica Corporation
    Inventors: Satoru Ikesu, Katsuji Ota
  • Patent number: 6140032
    Abstract: A silver halide color photographic light-sensitive material characterized in that the light-sensitive material contains a yellow coupler represented by the following Formula [I]; ##STR1## wherein R.sub.1 represents an alkyl group, a cycloalkyl group, an amino group, a heterocyclic group or an aryl group, R.sup.2 represents a straight chain or branched unsubstituted alkyl group having not less than 2 carbon atoms, X represents a chlorine atom, an alkoxy group or aryloxy group. Y represents an acylamino group or a chlorine atom when R.sub.1 represents an alkyl group, a cycloalkyl group, an amino group or a heterocyclic group , and Y represents an sulfonylamino group, a chlorine atom or oxycarbonyl group when R.sub.1 represents an aryl group. n represents an integer of 0 to 4. When n is not less than 2, plural Y may be either the same or different.
    Type: Grant
    Filed: November 19, 1998
    Date of Patent: October 31, 2000
    Assignee: Konica Corporation
    Inventors: Satoru Ikesu, Katsuji Ota, Kazuhiko Kimura
  • Patent number: 6004739
    Abstract: A silver halide color photographic light-sensitive materail is disclosed. The light-sensitive material comprises a support having thereon a blue-sinsitive silver halide emulsion layer containing a yellow dye-forming coupler represneted by the following Formula I; ##STR1## wherein R.sub.1 is an aliphatic group or an aromatic group, R.sub.2 is an anti-diffusion aliphatic group or aromatic group, R.sub.3 is a hydrogen atom or a halogen atom, and X is a 5- or 6-member nitrogen-containing heterocyclic group capable of being released upon couling reaction with the oxidation product of a color developing agent.
    Type: Grant
    Filed: November 11, 1997
    Date of Patent: December 21, 1999
    Assignee: Konica Corporation
    Inventors: Satoru Ikesu, Katsuji Ota
  • Patent number: 5763618
    Abstract: A method of manufacturing a sulfide comprises the steps of (a) dissolving a thiol in a solvent to form a solution; (b) oxidizing the thiol to a disulfide in the presence of a first oxidizing agent in the solution; (c) reacting the disulfide with a coupler in the presence of a base and a second oxidizing agent, without isolation of said disulfide from the solution, to form a reaction mixture in which the sulfide is produced; and (d) obtaining said sulfide.
    Type: Grant
    Filed: April 29, 1996
    Date of Patent: June 9, 1998
    Assignee: Konica Corporation
    Inventors: Ryuzou Watanabe, Shinri Tanaka, Katsuji Ota, Michiko Nagato, Tomio Horiuchi