Patents Examined by Dennis E. Talbert, Jr.
  • Patent number: 4279981
    Abstract: The present invention provides trisazo compounds expressed by the general formula I ##STR1## [wherein A represents ##STR2## (wherein R represents hydrogen, alkyl radical, alkoxy radical, nitro radical, dialkylamino radical or halogen, and n is an integer of 1, 2 or 3, R may be either identical or different when n is an integer of 2 or 3)]; a process for the preparation of said trisazo compounds; and electrophotographic sensitive materials having a high sensitivity as well as a high flexibility which comprise a conductive support and a photosensitive layer containing a trisazo compound, as an effective ingredient thereof, which is expressed by the general formula II ##STR3## [wherein A' represents ##STR4## (wherein Z represents aromatic rings such as benzene ring, naphthalene ring, etc., hetero rings such as indole ring, carbazole ring, benzofuran ring, etc. or their substituents, Ar.sub.1 represents aromatic rings such as benzene ring, naphthalene ring, etc., hetero rings such as dibenzofuran ring, etc.
    Type: Grant
    Filed: April 18, 1978
    Date of Patent: July 21, 1981
    Assignee: Ricoh Company, Ltd.
    Inventors: Masafumi Ohta, Kiyoshi Sakai, Mitsuru Hashimoto, Akio Kozima, Masaomi Sasaki
  • Patent number: 4272598
    Abstract: The present invention provides disazo compounds expressed by the general formula I ##STR1## [wherein A represents ##STR2## (wherein R represents alkyl radical, alkoxy radical, nitro radical, dialkylamino radical or halogen, n is 0 or an integer of 1, 2 or 3, and R may be either identical or different when n is an integer of 2 or 3)]; a process for the preparation of said compounds; and electrophotographic sensitive materials having a high sensitivity as well as a high flexibility which comprise a conductive support and a photosensitive layer formed thereon, said photosensitive layer containing a disazo compound, as an effective ingredient, which is expressed by the general formula II ##STR3## [wherein A' represents ##STR4## (wherein X represents aromatic rings such as benzene ring, naphthalene ring, etc., hetero rings such as indole ring, carbazole ring, benzofuran ring, etc. or their substituents, Ar.sub.1 represents aromatic rings such as benzene ring, naphthalene ring, etc.
    Type: Grant
    Filed: April 20, 1978
    Date of Patent: June 9, 1981
    Assignee: Ricoh Co., Ltd.
    Inventors: Masaomi Sasaki, Kiyoshi Sakai, Mitsuru Hashimoto, Masafumi Ohta, Akio Kozima
  • Patent number: 4255507
    Abstract: An electrophotographic process of this invention is achieved by subjecting a photosensitive screen to a matched performance of voltage applications and image irradiation to form a primary electrostatic latent image for modulating the flow of corona ions to enable a secondary electrostatic latent image on a recording member disposed in close proximity to the screen bearing the primary electrostatic latent image.
    Type: Grant
    Filed: February 21, 1978
    Date of Patent: March 10, 1981
    Assignee: Canon Kabushiki Kaisha
    Inventors: Katsunobu Ohara, Keiji Tanaka, Yujiro Ando, Inao Moriyama
  • Patent number: 4255508
    Abstract: A flexible metal printing cylinder having a coating of a crystalline photoconductive material thereon. The cylinder is an electrodeposited sleeve of nickel or similar material that is a fraction of a millimeter in thickness which is adapted to be mounted in a printing press in order to enable the press to print electrostatically. The coating is applied by r.f. sputtering and comprises a thin film layer of the order of about 2000 to 6000 Angstroms thick of a wholly inorganic, electronically anisotropic, crystalline, flexible, high gain photoconductive material, as for example ultrapure cadmium sulfide. The cylinder may have an image adhered to its surface which is of dry insulating toner.
    Type: Grant
    Filed: December 27, 1977
    Date of Patent: March 10, 1981
    Assignee: Coulter Systems Corporation
    Inventor: Manfred R. Kuehnle
  • Patent number: 4252883
    Abstract: An electrophotographic photosensitive member is prepared by dispersing photoconductive particle in a binder resin in a solvent and forming a photoconductive film by removing the solvent. Transition temperature of the binder resin and the preparation temperature are to be selected in such a way that the balance between these temperatures is within a certain range.
    Type: Grant
    Filed: February 13, 1980
    Date of Patent: February 24, 1981
    Assignee: Canon Kabushiki Kaisha
    Inventors: Noboru Komura, Hirokazu Negishi, Katsumobu Ohara, Yoshitaka Ohori
  • Patent number: 4251613
    Abstract: The present invention provides disazo compounds expressed by the general formula I ##STR1## a process for the preparation of said compounds; and electrophotographic sensitive material having a high sensitivity as well as a high flexibility which comprise a conductive support and a photosensitive layer formed thereon, said photosensitive layer containing a disazo compound, as an effective ingredient, which is expressed by the general formula II A'--N.dbd.N--Z--N.dbd.N--A'.
    Type: Grant
    Filed: May 22, 1978
    Date of Patent: February 17, 1981
    Assignee: Ricoh Company, Ltd.
    Inventors: Masaomi Sasaki, Kiyoshi Sakai, Mitsuru Hashimoto, Masafumi Ohta, Kyoji Tsutsui
  • Patent number: 4251614
    Abstract: The present invention provides disazo compounds expressed by the general formula: ##STR1## [wherein A represents a member selected from the group consisting of ##STR2## (wherein X represents a member selected from the group consisting of aromatic rings such as benzene ring, naphthalene ring, etc., hetero rings such as indole ring, carbazole ring, benzofuran ring, etc. and their substituents, Ar.sub.1 represents a member selected from the group consisting of aromatic rings such as benzene ring, naphthalene ring, etc., hetero rings such as dibenzofuran ring, etc. and their substituents, Ar.sub.2 and Ar.sub.3 represent a member selected from the group consisting of aromatic rings such as benzene ring, naphthalene ring, etc. and their substituents, R.sub.1 and R.sub.3 represent a member selected from the group consisting of hydrogen, lower alkyl radical or phenyl radical and their substituents and R.sub.
    Type: Grant
    Filed: June 30, 1978
    Date of Patent: February 17, 1981
    Assignee: Ricoh Company, Ltd.
    Inventors: Masaomi Sasaki, Kiyoshi Sakai, Mitsuru Hashimoto, Masafumi Ohta, Kyoji Tsutsui
  • Patent number: 4247614
    Abstract: The present invention provides an electrophotographic element which comprises some disazo pigment expressed by the general formula ##STR1## [wherein R.sub.1 represents a member selected from the group consisting of hydrogen atom, methyl radical, ethyl radical, methoxy radical, ethoxy radical, chlorine atom, bromine atom, nitro radical, dimethylamino radical, diethylamino radical and phenyl radical; A represents ##STR2## (wherein R.sub.2 represents hydrogen atom or chlorine atom) or ##STR3## and n is an interger of 1 or 2.] as effective component contained in the photosensitive layer thereof.
    Type: Grant
    Filed: November 16, 1979
    Date of Patent: January 27, 1981
    Assignee: Ricoh Co., Ltd.
    Inventors: Masafumi Ohta, Kiyoshi Sakai, Mitsuru Hashimoto, Masaomi Sasaki, Tomiko Kawakami
  • Patent number: 4244322
    Abstract: A developing apparatus includes a cylindrical drum having a photosensitive layer provided around the outer peripheral surface thereof, and a magnetic roller mounted within a receptacle and having permanent magnets oriented in a body thereof and a rotating cylindrical sleeve provided on the outer peripheral surface of the body thereof. The receptacle holds a developer mixture including powdered iron and toner and it is opened to provide a magnetic brush exposure window where the magnetic roller and cylindrical drum face each other with a gap left therebetween. The magnetic roller continuously supplies the developer mixture in the form of a magnetic brush toward the gap between the magnetic roller and the cylindrical drum. A doctor blade is attached to the lowest edge portion of the exposure window to restrict the thickness of the magnetic brush.
    Type: Grant
    Filed: March 6, 1978
    Date of Patent: January 13, 1981
    Assignee: Tokyo Shibaura Electric Co., Ltd.
    Inventors: Yutaka Nomura, Mitsuaki Koyama, Masahiro Katou
  • Patent number: 4244321
    Abstract: A development electrode arrangement located in closely-spaced parallel relation to the charge retaining surface of a moving electrographic recording medium. A toner application unit feeds electrostatically charged toner particles into the space between the development electrode arrangement and the charge retaining surface of the recording medium. The development electrode arrangement is comprised of an array of electrode segments each segment being electrically isolated from each other segment and each segment being allowed to float electrically. The floating electrode segments are so arranged that every element of the recording medium that is subjected to the toning process passes over at least one electrode segment during the toning process.
    Type: Grant
    Filed: February 14, 1978
    Date of Patent: January 13, 1981
    Assignee: James River Graphics, Inc.
    Inventor: John D. Plumadore
  • Patent number: 4240375
    Abstract: An apparatus for detecting the concentration of toner particles contained in the developing powder is disclosed wherein the developing powder comprising a mixture of magnetic carrier particles and the toner particles is transported while being adsorbed by a magnet roll, and rubbing an electrostatic recording surface lightly to develop an electrostatic latent image. After development, the developing powder is separated from the magnet roll, flows along a guide path, and forms a magnetic path for a flat detecting coil with the flat surfaces thereof placed in the guide path in the same direction as the flow of the developing powder. In response to the magnitude of the inductance of the detecting coil, an electrical circuit produces an electrical signal corresponding to the mixing ratio between the magnetic carrier particles and the toner particles in the developing powder.
    Type: Grant
    Filed: April 11, 1978
    Date of Patent: December 23, 1980
    Assignee: Hitachi, Ltd.
    Inventor: Isamu Terashima
  • Patent number: 4231319
    Abstract: A cascade-type developing unit for an electrostatic copying apparatus is disclosed. A mixture of toner and carrier particles circulates in the unit and its particles become electrostatically charged due to electrification. An arrangement is provided for limiting the charge of the particles to user-selectable values.
    Type: Grant
    Filed: April 4, 1978
    Date of Patent: November 4, 1980
    Assignee: AGFA-Gevaert, A.G.
    Inventors: Gottfried Waibel, Gunther Maurischat, Heinz Webersik
  • Patent number: 4230785
    Abstract: A pressure sensitive adhesive rendered electrically conductive without adversely affecting pressure sensitive adhesiveness by adding thereto electrically conductive material.Where a conductive pressure sensitive adhesive layer is used in the form of a coating on a backing sheet, the protective release sheet or liner for the pressure sensitive adhesive coating may also be rendered conductive by the inclusion of electrically conductive material therein so that the thickness of the laminate is conductive.
    Type: Grant
    Filed: February 27, 1978
    Date of Patent: October 28, 1980
    Assignee: Dennison Manufacturing Company
    Inventors: Lee A. Carlson, Richard G. Miekka
  • Patent number: 4226928
    Abstract: In a laminated photosensitive material for electrophotography, an intermediate layer comprising, incorporated in a binder, phthalocyanine or a phthalocyanine derivative and a polycyclic aromatic nitro compound at a specific ratio is formed on an electrically conductive substrate, and a top layer comprising an organic polymeric photoconductor and the above polycyclic aromatic nitro compound at a specific ratio is laminated on the intermediate layer. In this photosensitive material, the dark decay speed is controlled in a range suitable for application to the repeated copying operation and the residual potential left on the exposure area can be reduced to a negligible level. Accordingly, occurrence of fogging is prevented and the toner transfer efficiency is improved. Further, this photosensitive material has improved mechanical, chemical and electric durabilities, and therefore, the life of the photosensitive material is remarkably prolonged.
    Type: Grant
    Filed: January 5, 1978
    Date of Patent: October 7, 1980
    Assignee: Mita Industrial Company, Ltd.
    Inventors: Toru Nakazawa, Keiichi Nagahashi, Tatsuo Aizawa
  • Patent number: 4225222
    Abstract: A printing drum is disclosed for electrostatic copying. The drum has a photo-electric-sensitive layer consisting of amorphous silicon advantageously containing hydrogen. The layer is designed to have a PN transition. A method is also disclosed for producing the layer by means of decomposition of a conveyed silicon-containing gas to which, if necessary, a gaseous doping material is added during a glow discharge in a heated printing drum.
    Type: Grant
    Filed: October 17, 1978
    Date of Patent: September 30, 1980
    Assignee: Siemens Aktiengesellschaft
    Inventor: Karl Kempter
  • Patent number: 4171275
    Abstract: Liquid developers for electrography comprise an electrically insulating carrier liquid containing (1) an addition polymer comprising a polar moiety and at least one additional moiety having predetermined solubility characteristics with respect to the carrier liquid, (2) a polymer comprising a phosphonate moiety, and (3) a halogenated polymer.
    Type: Grant
    Filed: August 12, 1977
    Date of Patent: October 16, 1979
    Assignee: Eastman Kodak Company
    Inventors: Stewart H. Merrill, Alec N. Mutz, Frederick A. Stahly
  • Patent number: 4165984
    Abstract: In general, materials having the structure ##STR1## WHEREIN N EQUALS 1 OR 2;A represents phenylene, naphthylene, anthracenyl, anthracenediyl, and dibenzothien-diyl;R.sub.1 and R.sub.2, which may be the same or different when taken alone represent hydrogen, cyano, alkylcarbonyl and arylcarbamoyl, arylcarbonyl, cyanoaryl;R.sub.1 and R.sub.2, when taken together, represent sufficient atoms to form substituted and unsubstituted radicals selected from the group consisting of furanylidene, fluorenylidene, pyrimidinylidene, thiazolidinylidene, pyrrolinyl, and indenyl, isoxazolinylidene, pyrazolinylidene and indanylidene, wherein said substituents are selected from the group consisting of hydrogen, cyano, aryl, oxo, thioxo, nitro, alkyl, nitroaryl, carbamoyl and cyanoalkyl; andAlkyl represents an alkyl group having from one to six carbon atoms; aryl represents an aromatic nucleus selected from the group consisting of benzene, naphthalene or anthracene, are useful in electrophoretic migration imaging processes.
    Type: Grant
    Filed: March 24, 1978
    Date of Patent: August 28, 1979
    Assignee: Eastman Kodak Company
    Inventors: James A. Van Allan, Louis J. Rossi, Melvin S. Bloom, Michael T. Regan, Hal E. Wright, Joseph Y. Kaukeinen
  • Patent number: 4165236
    Abstract: A color photographic light-sensitive material which comprises a support having thereon at least a red-sensitive silver halide emulsion layer, a green-sensitive silver halide emulsion layer, a yellow filter layer and a blue-sensitive silver halide emulsion layer, the red-sensitive silver halide emulsion layer being positioned farther from the support than the yellow filter layer.
    Type: Grant
    Filed: October 26, 1976
    Date of Patent: August 21, 1979
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Yasuo Aotsuka
  • Patent number: 4120728
    Abstract: A thermally developable light-sensitive material comprising a support having thereon at least one layer containing (a) an organic silver salt; (b) a catalytic amount of a light-sensitive silver halide prepared by mixing a solution of a compound capable of releasing a halide ion and a solution of a compound capable of releasing silver ion in the presence of a surface active agent; (c) a reducing agent and (d) a binder.
    Type: Grant
    Filed: April 26, 1976
    Date of Patent: October 17, 1978
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shinpei Ikenoue, Takao Masuda
  • Patent number: 4120720
    Abstract: In an electrostatographic recording member comprising at least:(1) an electrically-insulating substrate;(2) an electrically-conductive intermediate layer overlying a first surface of said substrate; and(3) an electrically-insulating outer layer overlying said conductive layer, said outer layer containing a photoconductive material or being composed of a dielectric material of high volume resistivity;The improvement comprising a combined means for accurately positioning said recording member during imaging thereof and for establishing an electrical ground connection to said intermediate conductive layer, said combined means comprising at least two separate holes through said recording member in a non-image area thereof and a conductive lacquer coating on the inner surface of at least one of said holes, said holes being adapted to receive protrusions during imaging to accurately position said recording member and said conductive lacquer being in electrical contact with the exposed intermediate conductive layer
    Type: Grant
    Filed: January 18, 1974
    Date of Patent: October 17, 1978
    Assignee: Scott Paper Company
    Inventor: Frank C. Gross