Patents by Inventor Kiyotaka Iiyama

Kiyotaka Iiyama 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: 5100861
    Abstract: A dyesheet for thermal transfer printing comprises a substrate supporting a transfer coat comprising one or more thermally transferable dyes dispersed throughout a polymeric binder comprising a mixture of polyvinylbutyral and a cellulosic polymer in which the percentage by weight of polyvinylbutyral lies within the range 65-85%.
    Type: Grant
    Filed: May 21, 1990
    Date of Patent: March 31, 1992
    Assignee: Imperial Chemical Industries PLC
    Inventors: Peter A. Gemmell, Kiyotaka Iiyama
  • Patent number: 5071825
    Abstract: A receiver sheet for dye diffusion thermal transfer printing comprises a white molecularly oriented polyester film, supporting a layer of dye-receptive material on one surface, the other surface of the film being laminated to an undersheet of higher compliance than the film, and the thickness of the film lying within the range 10 to 50 .mu.m. The undersheet increases the effective compliance of the receiver, increasing the area heated during printing thereby to give better pixel transfer.
    Type: Grant
    Filed: December 22, 1989
    Date of Patent: December 10, 1991
    Assignee: Imperial Chemical Industries PLC
    Inventors: Kiyotaka Iiyama, Anthony J. Nelson
  • Patent number: 5024699
    Abstract: A leuco dye having the formula ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each represent a lower alkyl group; R.sup.5 represents an .alpha.-naphthyl group, .beta.-naphthyl group or ##STR2## wherein R.sup.6 represents --NHCOR.sup.9, a halogen or an amino group which is unsubstituted or substituted by one or two C.sub.1 -C.sub.4 alkyl groups which are the same or different; and R.sup.7, R.sup.8 and R.sup.9 each represent hydrogen or a lower alkyl group, provided that when both R.sup.7 and R.sup.8 are hydrogen, R.sup.6 represents --NHCOR.sup.9 or bromine.These dyes absorb in the near-infrared region and yield colored images with a color developer therefor with excellent preservability.
    Type: Grant
    Filed: March 2, 1990
    Date of Patent: June 18, 1991
    Assignee: Ricoh Company, Ltd.
    Inventors: Kiyotaka Iiyama, Kunio Hayakawa, Masahiro Nakata, Kaoru Kodera, Osamu Miyazaki
  • Patent number: 4981970
    Abstract: Coloring phthalide compounds having general formula [I], a method of producing the phthalide compounds and a recording material comprising as a coloring component any of the coloring phthalide compounds, are disclosed, ##STR1## wherein R.sup.1 and R.sup.2 each represent a straight chain or branched alkyl group having 1 to 6 carbon atoms, a cycloalkyl group, or a benzyl group, and R.sup.1 and R.sup.2 in combination may form a ring; R.sup.3 represents and alkyl group having 1 to 4 carbon atoms; R.sup.4 represents a dialkylamino group having 1 to 6 carbon atoms, a cyclic amino group or halogen; l is an integer of 0 to 4; A represents ##STR2## wherein R.sup.5 and R.sup.6 each represent a straight chain or branched alkyl group having 1 to 8 carbon atoms, a cycloalkyl group, or a benzyl group, R.sup.5 and R.sup.6 in combination may form a ring; and B is the same as A, or represents a phenyl group which may have a substituent.
    Type: Grant
    Filed: August 16, 1989
    Date of Patent: January 1, 1991
    Assignee: Ricoh Company, Ltd.
    Inventors: Kiyotaka Iiyama, Kunio Hayakawa
  • Patent number: 4940691
    Abstract: Coloring phthalide compounds having general formula [I] ##STR1## R.sup.1 represents hydrogen, an alkyl group, or halogen, m is an integer of 1 to 4, when m is 1, R.sup.2 represents hydrogen, an amino group, an alkylamino group, a dialkylamino group, a cyclic amino group, an alkyl group, or halogen, when m is 2 to 4, R.sup.2 represents halogen, R.sup.3 and R.sup.4 each represent a straight chain or branched alkyl group having 1 to 8 carbon atoms, a cyclic alkyl group, or a benzyl group, and R.sup.5 represents hydrogen, an alkyl group or an alkoxyl group; and a thermosensitive recording material including a thermosensitive recording layer comprising any of the above coloring phthalides and a color developer capable of inducing color formation in the phthalide compound are disclosed.
    Type: Grant
    Filed: May 19, 1989
    Date of Patent: July 10, 1990
    Assignee: Ricoh Company, Ltd.
    Inventors: Kiyotaka Iiyama, Kunio Hayakawa
  • Patent number: 4925828
    Abstract: A leuco dye having the formula ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each represent a lower alkyl group; R.sup.5 represents an .alpha.-naphthyl group, .beta.-naphthyl group or ##STR2## wherein R.sup.6 represents --NHCOR.sup.9, a halogen or an amino group which is unsubstituted or substituted by one or two C.sub.1 -C.sub.4 alkyl groups which are the same or different; and R.sup.7, R.sup.8 and R.sup.9 each represent hydrogen or a lower alkyl group, provided that when both R.sup.7 and R.sup.8 are hydrogen, R.sup.6 represents --NHCOR.sup.9 or bromine.These dyes absorb in the near-infrared region and yield colored images with a color developer therefor with excellent preservability.
    Type: Grant
    Filed: May 31, 1988
    Date of Patent: May 15, 1990
    Assignee: Ricoh Company, Ltd.
    Inventors: Kiyotaka Iiyama, Kunio Hayakawa, Masahiro Nakata, Kaoru Kodera, Osamu Miyazaki
  • Patent number: 4880762
    Abstract: Coloring phthalide compounds having general formula [I], a method of producing the phthalide compounds and a recording material comprising as a coloring component any of the coloring phthalide compounds are disclosed, ##STR1## wherein R.sup.1 and R.sup.2 each represent a straight chain or branched alkyl group having 1 to 6 carbon atoms, a cycloalkyl group, or a benzyl group, and R.sup.1 and R.sup.2 in combination may form a ring; R.sup.3 represents an alkyl group having 1 to 4 carbon atoms; R.sup.4 represents a dialkylamino group having 1 to 6 carbon atoms, a cyclic amino group or halogen, l is an integer of 0 to 4; A represents ##STR2## wherein R.sup.5 and R.sup.6 each represent a straight chain or branched alkyl group having 1 to 8 carbon atoms, a cycloalkyl group, or a benzyl group, R.sup.5 and R.sup.6 in combination may form a ring; and B is the same as A, or represents a phenyl group which may have a substituent.
    Type: Grant
    Filed: November 20, 1987
    Date of Patent: November 14, 1989
    Assignee: Ricoh Company, Ltd.
    Inventors: Kiyotaka Iiyama, Kunio Hayakawa
  • Patent number: 4845072
    Abstract: A thermosensitive recording material is disclosed, which comprises a support material and a thermosensitive coloring layer formed thereon comprising a leuco dye, a color developer capable of inducing color formation in the leuco dye upon application of heat thereto, and a vinyl ether compound having the general formula, ##STR1## which serves as thermosensitivity improvement agent.
    Type: Grant
    Filed: November 20, 1987
    Date of Patent: July 4, 1989
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiromi Furuya, Kiyotaka Iiyama
  • Patent number: 4665410
    Abstract: A multi-color thermosensitive recording material comprising a support material, three or more thermosensitive coloring layer successively overlaid thereon and decolorizing intermediate layers interposed between the thermosensitive coloring layers, with at least the thermosensitive coloring layers except the thermosensitive coloring layer adjacent to the support material each comprising a basic leuco dye and a color developer capable of inducing color formation in the leuco dye upon application of thermal energy at a predetermined temperature, and each decolorizing intermediate layer containing a decolorizing agent which is capable of decolorizing the color developed in the thermosensitive coloring layer adjacent to the decolorizing intermediate layer when heated to a higher temperature than the predetermined coloring temperature for the thermosensitive coloring layer, which decolorizing agent for use in at least one of the decolorizing layers is (i) a N,N'-disubstituted aromatic diamide compound, (ii) a piper
    Type: Grant
    Filed: April 18, 1986
    Date of Patent: May 12, 1987
    Assignee: Ricoh Company, Ltd.
    Inventors: Kiyotaka Iiyama, Norihiko Inaba
  • Patent number: 4663641
    Abstract: A two-color thermosensitive recording adhesive label comprising a support material, a first lower thermosensitive coloring layer and a second upper thermosensitive coloring layer supported on the support material, capable of yielding two different colors, with the coloring temperature for the second thermosensitive coloring layer being lower than that for the first thermosensitive coloring layer, in which at least the second thermosensitive coloring layer contains a basic leuco dye and a color developer capable of inducing color formation in the leuco dye upon application of thermal energy, and a decolorizing agent for decoloring the color developed in the second thermosensitive coloring layer at the time of color development of the first thermosensitive coloring layer is contained in the first thermosensitive coloring layer or in a decolorizing intermediate layer interposed between the first thermosensitive coloring layer and the second thermosensitive layers, which decolorizing agent is selected from partic
    Type: Grant
    Filed: March 17, 1986
    Date of Patent: May 5, 1987
    Assignee: Ricoh Company, Ltd.
    Inventors: Kiyotaka Iiyama, Norihiko Inaba
  • Patent number: 4638340
    Abstract: A two-color thermosensitive recording label capable of forming two different colors when heated at different temperatures is disclosed, which comprises: (a) a support material and the following layers successively formed thereon, (b) a first thermosensitive coloring layer which is colored in a first color at a predetermined high temperature T, formed on one side of the support material, (c) a decolorizing layer containing a decolorizing agent, (d) an intermediate layer, (e) a second thermosensitive coloring layer, which is colored in a second color at a predetermined low temperature, the second color being decolorized by the decolorizing agent when heated to a predetermined temperature, so that the color developed in the second thermosensitive coloring layer is prevented from being mixed with the color developed in the first thermosensitive coloring layer, and the second thermosensitive coloring layer and the second color are protected from the decolorizing layer by the intermediate layer so long as the secon
    Type: Grant
    Filed: July 29, 1985
    Date of Patent: January 20, 1987
    Assignee: Ricoh Company, Ltd.
    Inventors: Kiyotaka Iiyama, Norihiko Inaba
  • Patent number: 4620204
    Abstract: A two-color thermosensitive recording material comprising (a) a support material, (b) a high temperature thermosensitive color-forming layer formed on the support material, (c) an intermediate layer formed on the high temperature color-forming layer and (d) a low temperature color-forming layer formed on the intermediate layer; a two-color thermosensitive recording material comprising (a) a support material, (b) a high temperature thermosensitive color-forming layer formed on the support material, (c) a decolorizing layer, (d) an intermediate layer formed on the decolorizing layer and (e) a low temperature color-forming layer formed on the intermediate layer; and a two-color thermosensitive recording material comprising (a) a support material, (b) a decolorizing and color developing layer formed on the support material, (c) an intermediate layer formed on the decolorizing and color developing layer and (d) a two-color thermosensitive coloring layer capable of yielding two different colors when heated at diffe
    Type: Grant
    Filed: October 9, 1985
    Date of Patent: October 28, 1986
    Assignee: Ricoh Company, Ltd.
    Inventors: Norihiko Inaba, Kiyotaka Iiyama
  • Patent number: 4620205
    Abstract: A two-color thermosensitive recording material comprising a support material, a high temperature color-forming layer comprising a first leuco dye and a first color developer overlaying the support material, a decolorizing layer containing a decolorizing agent overlaying the high temperature color-forming layer, and a low-temperature color-forming layer comprising a second leuco dye and a second color developer overlaying the decolorizing layer, wherein the melting points of the first leuco dye and the first color developer of the high temperature color-forming layer are 150.degree. C. or higher, the melting points of the second leuco dye and the second color developer of the low temperature color-forming layer are 60.degree. C. or higher and the melting point of at least one of the second leuco dye and the second color developer is 130.degree. C. or lower, and the melting point of the decolorizing agent is in the range of 120.degree. C. to 160.degree. C.
    Type: Grant
    Filed: September 30, 1985
    Date of Patent: October 28, 1986
    Assignee: Ricoh Company, Ltd.
    Inventors: Kiyotaka Iiyama, Nirohiko Inaba
  • Patent number: 4613878
    Abstract: A two-color thermosensitive recording material comprising a support material, a first lower thermosensitive coloring layer and a second upper thermosensitive coloring layer supported on the support material, capable of yielding two different colors, with the coloring temperature for the second thermosensitive coloring layer being lower than that for the first thermosensitive coloring layer, in which at least the second thermosensitive coloring layer contains a basic leuco dye and a color developer capable of inducing color formation in the leuco dye upon application of thermal energy, and a decolorizing agent for decoloring the color developed in the second thermosensitive coloring layer at the time of color development of the first thermosensitive coloring layer is contained in the first thermosensitive coloring layer or in a decolorizing intermediate layer interposed between the first thermosensitive coloring layer and the second thermosensitive layers, which decolorizing agent is a di-substituted aromatic
    Type: Grant
    Filed: November 15, 1985
    Date of Patent: September 23, 1986
    Assignee: Ricoh Company, Ltd.
    Inventors: Norihiko Inaba, Kiyotaka Iiyama
  • Patent number: 4517580
    Abstract: A thermosensitive recording material comprising a support material and a thermosensitive coloring layer formed thereon, in which thermosensitive coloring layer, colored images are formed by the reaction between a colorless or light-colored leuco dye and a color-developer of the following formula capable of inducing color formation in the leuco dye upon application of heat thereto, ##STR1## wherein X indicates halogen.
    Type: Grant
    Filed: January 6, 1984
    Date of Patent: May 14, 1985
    Assignee: Ricoh Company, Ltd.
    Inventors: Kiyotaka Iiyama, Keishi Taniguchi
  • Patent number: 4511910
    Abstract: A thermosensitive recording material is disclosed, which comprises a colorless or light-colored coloring material, and a color developer capable of inducing color formation in the colorless or light-colored coloring material upon application of heat thereto, in which the color developer is a phenolic material of the formula ##STR1## wherein R represents an straight-chain or branched alkylene group having at least one hydroxyl group.
    Type: Grant
    Filed: April 12, 1984
    Date of Patent: April 16, 1985
    Inventors: Keishi Taniguchi, Kiyotaka Iiyama
  • Patent number: 4507670
    Abstract: A thermosensitive recording material comprising a support material and a thermosensitive recording layer formed thereon, in which thermosensitive coloring layer, colored images are formed by the reaction between a colorless or light-colored leuco dye of the following formula (I) and a color developer of the following formula (II) which is capable of inducing color formation in the leuco dye upon application of heat thereto, ##STR1## wherein R.sup.1 and R.sup.2 each indicate a lower alkyl group, and X indicates halogen, ##STR2## wherein R.sup.3 and R.sup.4 each indicate hydrogen, halogen, an alkyl group, an acyl group, a halogenated alkyl group or an unsubstituted or substituted aromatic group.
    Type: Grant
    Filed: January 24, 1984
    Date of Patent: March 26, 1985
    Assignee: Ricoh Company, Ltd.
    Inventors: Takanori Motosugi, Hisashi Sakai, Kiyotaka Iiyama
  • Patent number: 4502068
    Abstract: A thermosensitive recording material is disclosed, which comprises a colorless or light-colored coloring material, and a color developer capable of inducing color formation in the colorless or light-colored coloring material upon application of heat thereto, in which the color developer is a phenolic material of the formula ##STR1## wherein R is an alkylene group selected from the group consisting of an alkylene group having 1 to 10 carbon atoms; an alkylene group having 1 to 8 carbon atoms which are not directly bonded to S in the formula, with 1 to 3 carboxylic groups contained therein; and an alkylene group having 2 to 15 carbon atoms, with 1 to 5 ether bonds contained therein.
    Type: Grant
    Filed: August 30, 1983
    Date of Patent: February 26, 1985
    Assignee: Ricoh Company, Ltd.
    Inventors: Keishi Taniguchi, Kiyotaka Iiyama
  • Patent number: 4179407
    Abstract: Catalyst bed for use in decomposition of ammonia gas, which comprises a mixture of catalysts for use in decomposition of ammonia gas and granules of catalytically inert substances.
    Type: Grant
    Filed: May 25, 1978
    Date of Patent: December 18, 1979
    Assignee: Ricoh Co., Ltd.
    Inventors: Kiyotaka Iiyama, Takeshi Matsui, Shigeru Kusakata, Hideo Watanabe, Michihisa Takahashi
  • Patent number: 4056824
    Abstract: A developing chamber and inlet and outlet chambers leading to and from the developing chamber respectively are uniformly heated in such a manner that ammonia gas used as a developing agent and water vapor are prevented from being condensed and contaminating copy sheets.
    Type: Grant
    Filed: September 1, 1976
    Date of Patent: November 1, 1977
    Assignee: Ricoh Company, Ltd.
    Inventors: Kiyotaka Iiyama, Takeshi Matsui, Shigeru Kusakata, Michihisa Takahashi