Patents Examined by J. David Welsh
  • Patent number: 5164281
    Abstract: A photosensitive body for electrophotography has as its principal constituent a photoconductive layer having amorphous silicon with hydrogen, a surface layer having a greater optical band gap than the photoconductive layer formed on a photoconductive base member, and an intermediate layer sandwiched therebetween.
    Type: Grant
    Filed: November 29, 1989
    Date of Patent: November 17, 1992
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Takashi Hayakawa, Shoichi Nagata, Shiro Narukawa, Kazuki Wakita, Kunio Ohashi, Yoshikazu Fujiwara
  • Patent number: 5100750
    Abstract: A photoconductor for electrophotography comprises a novel organic compound as a charge transporting substance. The organic compounds is represented by the following general formula: ##STR1## wherein, each of R.sub.1 to R.sub.4 stands for a hydrogen atom, a halogen atom, an alkoxy group, or an alkyl group, an aryl group, an alkenyl group, an aralkyl group, a thienyl group, each of which may have a substituent(s).
    Type: Grant
    Filed: April 6, 1989
    Date of Patent: March 31, 1992
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Masami Kuroda, Youichi Nakamura, Noboru Furusho
  • Patent number: 5015551
    Abstract: An electrophotographic liquid developer is disclosed. The developer is comprised of resin particles dispersed in a high-insulating low dielectric non-aqueous solvent. The resin particles are prepared by polymerizing or copolymerizing a specific styrenic monomer in an organic solvent containing a polymer which is substantially soluble in the organic solvent. The liquid developer is particularly suitable for making a printing plate or sheet by an electrophotographic process.
    Type: Grant
    Filed: May 23, 1984
    Date of Patent: May 14, 1991
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hiromichi Tachikawa, Hiroaki Yokoya, Nobuo Suzuki, Syu Watarai
  • Patent number: 4999268
    Abstract: An electrophotographic photoreceptor is disclosed, comprising a light-sensitive layer on an electrically conductive substrate, wherein the light-sensitive layer comprises particles of selenium or a selenium alloy as the charge generating material, and at least one compound represented by formula (I), ##STR1## wherein R.sub.1 represents a hydrogen atom, an alkyl group or an alkoxyl group; R.sub.2 and R.sub.3, which may be the same or different, represent each a hydrogen atom, an alkyl group, an alkoxyl group, a halogen atom, an alkoxycarbonyl group or a substituted amino group; and at least one compound represented by formula (II), ##STR2## wherein R.sub.4, R.sub.5 and R.sub.6, which may be the same or different, represent each a hydrogen atom, an alkyl group, an alkoxy group, a halogen atom, an alkoxycarbonyl group or a substituted amino group, as the charge transporting materials.
    Type: Grant
    Filed: February 6, 1989
    Date of Patent: March 12, 1991
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Fumio Ojima, Kiyokazu Mashimo, Masahiko Hozumi, Taketoshi Hoshizaki, Kazuyuki Nakamura
  • Patent number: 4997593
    Abstract: A variable electroconductivity material characterized by being obtaine by formulating (a) an electroconductivity variation imparting agent comprising a substance which is caused by light or heat energy to undergo structural change, reversibly or irreversibly, between nonionic and ionic structures and (b) a charge transport substance the electroconductivity of which is varied by said structural change of said electroconductivity variation imparting agent, and an information recording medium obtained by the use of this material has excellent memory stability, and also a light (heat) converting device having conversion characteristics can be obtained by the use of this material.
    Type: Grant
    Filed: January 4, 1989
    Date of Patent: March 5, 1991
    Assignee: Dai Nippon Insatsu Kabushiki Kaisha
    Inventors: Eiichi Inoue, Atsumi Noshiro, Minoru Utsumi
  • Patent number: 4990427
    Abstract: The invention relates to a toner for developing electrostatic latent images for use in copying machines and including a thermoplastic resin and a black coloring material as main components. The black coloring material comprises a substantially non-magnetic inorganic black pigment of 5-25 cc/100 g oil absorption and 0.5-10 .mu.m average particle diameter, to obtain high quality copy images having fine textures.
    Type: Grant
    Filed: June 21, 1985
    Date of Patent: February 5, 1991
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Toshitaro Kohri, Hitoshi Kato, Kunio Takahashi, Junji Machida
  • Patent number: 4990423
    Abstract: A photosensitive member for electrophotography which comprises a conductive substrate and a photoconductive layer, the photoconductive layer being an amorphous silicon germanium containing hydrogen and/or a halogen at a specific amount, deposited by electron cyclotron resonance method, which is useful for image formation apparatus such as a laser printer.
    Type: Grant
    Filed: June 20, 1989
    Date of Patent: February 5, 1991
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Takashi Hayakawa, Shiro Narikawa, Kunio Ohashi
  • Patent number: 4986211
    Abstract: A toning method and member for electrostatography wherein a recording member containing information on its image bearing surface in the form of electrostatic latent images of one polarity is toned by attracting to such latent images toner material of opposite polarity including providing a carrier or toning member according to the invention containing on at least one surface thereof a dry pre-toner coating; activating such pre-toner coating with an insulative solvent to thereby solvate and confer opposite polarity to such pre-toner coating contained thereon while rendering such pre-toner coating releasable from the carrier member; establishing virtual contact between the activated and releasable pre-toner coating on the carrier member and the image bearing surface of the recording member; transferring the pre-toner coating in image configuration onto the recording member by attraction to the latent images to form toner deposits thereon; and separating the carrier member from the recording member.
    Type: Grant
    Filed: September 7, 1989
    Date of Patent: January 22, 1991
    Assignee: Coulter Systems Corporation
    Inventors: Joseph R. Coulter, Jr., Josef Matkan
  • Patent number: 4983484
    Abstract: A photosensitive material for use in electronic photography having a photosensitive layer principally comprises an amorphous selenium-arsenic alloy, the alloy having present therein crystalline arsenic trioxide in the form of arsenolite and claudetite. The charging ability of the photosensitive material is improved by controlling the ratio of relative absorbance peak intensity in the infrared spectrum of arsenolite to claudetite to be at least 0.5.
    Type: Grant
    Filed: December 21, 1989
    Date of Patent: January 8, 1991
    Assignee: Fuji Electric Co., Ltd.
    Inventor: Kazuyuki Urabe
  • Patent number: 4983741
    Abstract: 1,2,4,5-Benzoylenebis(naphtho[2,3-d]imidazole compounds of the following formula (I) or (II): ##STR1## wherein R and R' each are a hydrogen atom, a halogen atom, a hydroxyl group, a carboxyl group which may be esterified, a sulfonic acid group which may be esterified, a lower alkyl group, a lower alkenyl group, a lower alkoxy group, an aryl group which may be substituted, an aralkyl group which may be substituted, a carbamoyl group which may be substituted or a sulfamoyl group which may be substituted and m and n each are an integer of 1 or 2, and photosensitive members for electrophotography having a photosensitive layer containing these compounds.
    Type: Grant
    Filed: December 8, 1988
    Date of Patent: January 8, 1991
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Satoshi Katayama, Eiji Imada, Shuhei Tsuchimoto
  • Patent number: 4981766
    Abstract: A light receiving member for electrophotography made up of an aluminum support and a multilayered light receiving layer exhibiting photoconductivity formed on the aluminum support, wherein the multilayered light receiving layer consists of a lower layer in contact with the support and an upper layer, the lower layer being made of an inorganic material containing at least aluminum atom (Al), silicon atoms (Si) and hydrogen atoms (H), and having portion in which the aluminum atoms (Al), silicon atoms (Si), and hydrogen atoms (H) are unevenly distributed across the layer thickness, the upper layer being made of a non-single-crystal material composed of silicon atoms (Si) as the matrix and at least either of hydrogen atoms (H) or halogen atoms (X) and containing at least one of carbon atoms, nitrogen atoms (N) and oxygen atoms (O) in the layer region in adjacent with the lower layer.
    Type: Grant
    Filed: September 6, 1989
    Date of Patent: January 1, 1991
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tatsuyuki Aoike, Masafumi Sano, Takehito Yoshino, Toshimitsu Kariya, Hiroaki Niino
  • Patent number: 4980256
    Abstract: A positively chargeable, one component type magnetic developer, comprises:100 parts by weight of a positively chargeable magnetic toner having triboelectric charges of +9 .mu.c/g to +20 .mu.c/g and a volume average particle size of 5 to 30 .mu.m,0.01 to 5 parts by weight of negatively chargeable resin fine particles having triboelectric charges of -10 .mu.c/g to -40 .mu.c/g and a primary average particle size of 0.01 to 4 .mu.m, and0.05 to 10 parts by weight of positively chargeable silica fine particles having triboelectric charges of +100 to +300 .mu.c/g and a primary average particle size of 5 m.mu. to 30 m.mu..
    Type: Grant
    Filed: May 26, 1988
    Date of Patent: December 25, 1990
    Assignee: Canon Kabushiki Kaisha
    Inventors: Seiichi Kato, Naoto Kitamori, Hisayuki Ochi
  • Patent number: 4978596
    Abstract: The present invention provides an electrophotographic toner, particularly with a good transferability and a good flowability, which comprises a binder resin and a coloring agent, the binder resin containing a lactone-modified epoxy resin, obtained by subjecting all or a portion of secondary hydroxyl groups of epoxy compounds having hydroxyl groups in the molecules to ring opening polymerization of lactone.The present invention further provides an electrophotographic toner with a good transferability, a good flowability and a good offset resistance and also with a fixability of transferred images, which comprises a binder resin and a coloring aent, the binder resin containing:(1) a lactone-modified epoxy resin, obtained by subjecting all or a portion of secondary hydroxyl groups of epoxy compounds having hydroxy groups in the molecules to ring opening polymerization of lactone,(2) styrene-butadiene rubber, and(3) polyester resin.
    Type: Grant
    Filed: March 17, 1986
    Date of Patent: December 18, 1990
    Assignee: Hitachi, Ltd.
    Inventors: Ryuichi Shimizu, Tsuneaki Kawanishi, Shigeo Suzuki, Shigeo Hosaka, Yasuki Mori, Toshikazu Narahara
  • Patent number: 4977054
    Abstract: A developer for electrostatic photography comprises toner and carrier coated with a composition comprising a silicone resin having (II) and (II') and at least one compound represented by following formula (III), (IV) or (V): ##STR1##
    Type: Grant
    Filed: July 5, 1989
    Date of Patent: December 11, 1990
    Assignees: Kao Corporation, Nippon Iron Powder Co. Ltd.
    Inventors: Toshio Honjo, Yuji Sato, Yoshihiro Fukushima, Masayoshi Nawa, Shinichiro Yasuda
  • Patent number: 4977055
    Abstract: A liquid developer for electrostatic photography comprising a resin dispersed in a non-aqueous solvent having an electric resistance of at least 10.sup.9 .OMEGA.cm and a dielectric constant of not higher than 3.5, wherein the dispersed resin is a polymer resin obtained by polymerizing a solution containing at least one mono-functional monomer (A) which is soluble in the aforesaid non-aqueous solvent but becomes insoluble after being polymerized, in the presence of at least one resin which is soluble in the aforesaid non-aqueous solvent and does not have a graft group polumerizable with the monomer and at least one oligomer (B) having a number average molecular weight of not more than 1.times.10.sup.4 and having at least one polar group selected from a carboxy group, a sulfo group, a hydroxy group, a formyl group, an amino group, a phosphono group, and ##STR1## wherein R.sup.0 represents a hydrocarbon group or --OR.sup.1, (wherein R.sup.
    Type: Grant
    Filed: December 22, 1989
    Date of Patent: December 11, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii, Hideyuki Hattori
  • Patent number: 4977056
    Abstract: An electrostatic liquid developer consisting essentially of(A) nonpolar liquid having a Kauri-butanol value of less than 30, present in a major amount,(B) thermoplastic resin particles having an average by area particle size of less than 10 .mu.m,(C) nonpolar liquid soluble ionic, nonionic, or zwitterionic compound, and(D) alkylhydroxybenzylpolyamine as define herein, being operably soluble in component (A) above.Optionally colorant, adjuvants, etc., are present. The liquid electrostatic developer is useful in copying, making proofs including digital color proofs, lithographic printing plates, and resists.
    Type: Grant
    Filed: August 10, 1987
    Date of Patent: December 11, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Lyla M. El-Sayed
  • Patent number: 4977052
    Abstract: An electrostatographic toner material suitably employable for the pressure fixing process, which comprises encapsulated toner particles having an average particle size in the range from about 0.5 to 1,000 microns, in which the toner particle comprises a pressure fixable adhesive core material containing a colorant and a pressure rupturable shell enclosing the core material, said shell being made of a polymer selected from the group consisting of polyurethane, polyurea and polythiourethane.A process preferably employable for the preparation of the toner material is also disclosed.
    Type: Grant
    Filed: February 20, 1990
    Date of Patent: December 11, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Takeshi Mikami
  • Patent number: 4975352
    Abstract: An electrophotographic photosensitive member comprises a conductive support, and having thereon a charge generation layer formed by coating a coating solution containing a charge generating material dispersed in the time of a total dispersing time T in the range of the formula 4 T.sub.1 .gtoreq.T.gtoreq.2 T.sub.1, followed by drying, and a charge transport layer formed by coating a coating solution containing a charge-transporting material followed by drying and a method of preparing it.
    Type: Grant
    Filed: April 24, 1990
    Date of Patent: December 4, 1990
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideki Anayama, Takashi Koyama
  • Patent number: 4973541
    Abstract: The present invention provides a developer for developing electrostatic latent image which comprises capsule toners and carriers; said capsule toner having many wrinkles or hollows and upheavals and containing liquid in a shell, and the carriers have no sharp edge or a lower specific gravity, the image copied by the developer can be fixed by pressure under low temperature.
    Type: Grant
    Filed: August 2, 1989
    Date of Patent: November 27, 1990
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Toshitaro Kohri, Junji Machida, Masahiro Anno
  • Patent number: 4973539
    Abstract: A toner composition comprised of a crosslinked thermotropic liquid crystalline polymer, a branched liquid crystalline polymer, or mixtures thereof.
    Type: Grant
    Filed: February 27, 1989
    Date of Patent: November 27, 1990
    Assignee: Xerox Corporation
    Inventors: Guerino Sacripante, T. Brian McAneney, Stephan Drappel, Sheau V. Kao, Lupu Alexandru