Patents by Inventor Isao Kohmura
Isao Kohmura 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).
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Method and apparatus for cleaning squeeze rollers in liquid electrophotographic developing apparatus
Patent number: 5060024Abstract: The invention provides a method for cleaning squeeze rollers of a liquid electrophotographic developing apparatus by a cleaning pad which makes it possible to develop an electrophotographic photoreceptor with causing no stains. The method includes the steps of supplying a solvent for liquid developer to a pair of squeeze rollers thereby to clean the rollers with the solvent; isolating the squeeze rollers from each other; and allowing one of the rollers which contacts with photosensitive surface of photoreceptor and the cleaning pad to contact with each other thereby to clean the roller kept isolated from the other squeeze roller by the cleaning pad. The invention further provides a liquid electrophotographic developing apparatus for carrying out the method.Type: GrantFiled: June 14, 1989Date of Patent: October 22, 1991Assignee: Mitsubishi Paper Mills LimitedInventors: Isao Kohmura, Takao Senga, Sadao Kuriu -
Patent number: 4892812Abstract: There is disclosed a silver halide photosensitive material for use under room-light wherein at least one silver halide emulsion layer contains (1) a spectrally unsensitized negative silver halide having an average grain size of 0.1 to 0.3 .mu.m and containing at least 80 mol % of silver chloride and (2) an organic desensitizer having an anodic polarographic potential and a cathodic polarographic potential which give a positive sum and this photosensitive material satisfying at least one of the following requirements:(a) said emulsion has undergone substantially no chemical ripening;a spectrally non-sensitizing dye capable of absorbing chiefly the rays in the range of from about 500 to 600 nm is contained in at least one of said photographic layers; and(c) at least one of the compounds from (i) to (v) as disclosed in the specification is contained in said emulsion layer.Type: GrantFiled: October 27, 1986Date of Patent: January 9, 1990Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Isao Kohmura, Katsuaki Iwaosa
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Patent number: 4879197Abstract: Disclosed is a process of developing images formed on a photosensitive material for electrophotography which does not cause the fogging originated from a pair of squeeze rolls made of materials different from each other and which includes the steps of developing the images with a liquid developer of the positive type containing a compound having a polyoxyethylene group or at least one compound selected from the group consisting of phosphate, sulfate and sulfonate salts having a group soluble in the carrier liquid and free from polyoxyethylene group.Type: GrantFiled: September 27, 1988Date of Patent: November 7, 1989Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Isao Kohmura, Takao Senga, Akira Furukawa, Hirokazu Yamamoto, Mamoru Nakatani, Jun Yamada
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Patent number: 4562140Abstract: Disclosed is a photosensitive material which comprises a support and at least an undercoating layer and a silver halide emulsion layer, said undercoating layer containing a matting agent having an average particle size larger than the thickness of the undercoating layer. Use of this photosensitive material for diffusion transfer process causes neither slipping between the photosensitive material and the image receptive layer nor pinholes in silver images.Type: GrantFiled: October 11, 1984Date of Patent: December 31, 1985Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Isao Kohmura, Jun Miura, Norio Kajima
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Patent number: 4345019Abstract: Transfer silver images high in maximum density, contrast and sharpness and small in dependency on developing temperatures are obtained by image wise exposing and developing a diffusion transfer light sensitive material which comprises a support having thereon at least a carbon black-containing layer and a silver halide emulsion layer present on said carbon black containing layer, said carbon black-containing layer and/or layer adjacent thereto containing 3-pyrazolidone compound represented by the following general formula: ##STR1## wherein R.sub.1 and R.sub.2 are hydroxyalkyl or alkyl group of 1-4 carbon atoms, at least one of R.sub.1 and R.sub.2 being hydroxyalkyl group and R.sub.3 is an aryl group.Type: GrantFiled: April 17, 1981Date of Patent: August 17, 1982Assignee: Mitsubishi Paper Mills, Ltd.Inventor: Isao Kohmura
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Patent number: 4302526Abstract: The negative materials of this invention for silver complex diffusion transfer process provide silver images high in density and improved in stability on image receiving materials. Said negative materials have the following characteristics:(a) The negative materials have silver halide emulsion layer in which the weight ratio of hydrophilic colloid to silver halide in terms of silver nitrate is 2 or less and(b) furthermore, the negative materials have an undercoat layer of hydrophilic colloid on a support and the silver halide emulsion layer of (a) on said undercoat layer, the weight ratio of the hydrophilic colloid of said undercoat layer to that of said silver halide emulsion layer being at least 2.Type: GrantFiled: November 6, 1979Date of Patent: November 24, 1981Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Isao Kohmura, Tamotsu Iwata, Shozi Oka
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Patent number: 4032690Abstract: Thermosensitive recording material for use in thermal printing, which is composed of a coating composition applied on a support, which coating composition comprises (a) a chromogenic compound, (b) an organic acid, (c) a water-soluble binder containing a carboxyl group and having a softening point of 200.degree. C or higher, (d) a filler, (e) a metal salt of a higher fatty acid and (f) a wax, said recording material having a Bekk surface smoothness of 100 to 500 seconds.Type: GrantFiled: January 24, 1975Date of Patent: June 28, 1977Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Isao Kohmura, Yukio Tahara, Kiyoshi Futaki, Hiroshi Tange
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Patent number: 4020232Abstract: This invention discloses a heat-sensitive recording sheet which comprises a support and, coated thereon, a heat-sensitive composition containing an organic base and at least one acylated lactone or sultone type acidic leuco dye capable of forming a color by reaction with said organic base at an elevated temperature. The invention further discloses as one embodiment a multicolor heat-sensitive recording sheet prepared by adding to the above-mentioned chromogenic system a chromogenic system comprising a normally solid phenolic substance and at least one basic chromogenic substance capable of forming a color by reaction with said phenolic substance at an elevated temperature. Preferable examples of the above-mentioned leuco dye are acrylated xanthene lactone type leuco dyes.Type: GrantFiled: May 14, 1975Date of Patent: April 26, 1977Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Isao Kohmura, Kiyoshi Futaki, Kozo Haino
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Patent number: 3984605Abstract: In a heat sensitive recording material comprising a support having a heat sensitive layer or layers thereon which comprise colorless or palely colored chromogenic substance and phenolic substance capable, upon heating, of causing color formation of said chromogenic substance, at least one organic amine derivatives are contained as a decolorizing agent in said heat sensitive layer or another layer adjacent to said heat sensitive layer. Using this recording material, two colors which are clearly distinguishable can be obtained.Type: GrantFiled: June 23, 1975Date of Patent: October 5, 1976Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Isao Kohmura, Kiyoshi Futaki, Kohzo Haino
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Patent number: 3937864Abstract: Heat-sensitive recording sheets having an improved stability comprising a colorless or pale-colored chromogenic compound and an organic acid for coloring the chromogenic compound by heating, which are characterized by containing phenol derivatives represented by the formula ##SPC1##Wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are hereinafter defined, is disclosed.Type: GrantFiled: September 4, 1973Date of Patent: February 10, 1976Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Isao Kohmura, Kiyoshi Futaki
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Patent number: 3936309Abstract: A heat-sensitive recording composition comprising a normally colorless or pale-colored chromogenic substance, a phenolic substance capable of developing the color of said chromogenic substance at an elevated temperature, and a water-soluble binder is not water resistant, but when incorporated with a compound having 2 to 10 1,2-epoxy ring structures ##EQU1## in one molecule as a hardner for said binder, the composition is rendered highly water resistant. Further, a coating liquid containing the said composition is prevented from coloration, and a recording sheet prepared by coating the said coating liquid on a support is prevented from coloration in texture.Type: GrantFiled: July 18, 1973Date of Patent: February 3, 1976Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Isao Kohmura, Kiyoshi Futaki, Yukio Tahara