Patents Examined by Roland E. Martin, Jr.
  • Ionic polyesters for electrically photosensitive composite particles, materials, elements and photoelectrophotoretic imaging methods
    Patent number: 4361636
    Abstract: Novel polyesters comprising repeating units from:(a) a diacid derived component comprising a group selected from the class consisting of an alkali metal or ammonium -sulfoarylene, -sulfoaryloxyarylene, -sulfocycloalkylene, -iminodisulfonylarylene, -iminobis(sulfonylarylene) or -sulfoaralkylarylene; and(b) a diol or diacid derived component comprising a group selected from the class consisting of bis(N-alkyl-N-alkyleneaminoaryl)arylalkane; bis(N-alkyl-N-alkyleneaminoaryl)diarylalkane; bis(N-alkyl-N-alkyleneaminoaryl)isoalkane; bis(N-alkyl-N-alkyleneaminoaryl)cycloalkane; dialkyleneaminotetraarylalkane; bis(alkylenearyl)arylamine and alkylenetriarylamine;are useful in electrically photosensitive composite particles, materials, layers and photoelectrophoretic imaging methods.
    Type: Grant
    Filed: April 22, 1981
    Date of Patent: November 30, 1982
    Assignee: Eastman Kodak Company
    Inventors: Henry V. Isaacson, Michael T. Regan
  • Electrophotographic light-sensitive disazo compounds having diphenylacrylonitrile group
    Patent number: 4359513
    Abstract: An electrophotographic light-sensitive medium is described comprising a light-sensitive layer containing a dis-azo compound represented by Formula (1) ##STR1## wherein A represents a coupler having aromatic properties.
    Type: Grant
    Filed: February 19, 1981
    Date of Patent: November 16, 1982
    Assignees: Copyer Co., Ltd., Canon Inc.
    Inventors: Kazuharu Katagiri, Katsunori Watanabe, Shigeto Ohta, Shozo Ishikawa, Makoto Kitahara
  • Disazo electrophotographic light-sensitive media
    Patent number: 4359515
    Abstract: An electrophotographic light-sensitive medium comprising a light-sensitive layer containing a dis-azo compound represented by Formula (1) ##STR1## wherein A represents a single chemical bond, a divalent hydrocarbon group containing a conjugated double bond, a divalent hydrocarbon group containing a nitrogen atom in a conjugated double bond, or a divalent heterocyclic group which may be condensed with a benzene ring or substituted and forms a conjugated double bond system in combination with the adjacent azomethine groups, and B and B', which may be the same or different, each represents a coupler having aromatic properties.
    Type: Grant
    Filed: February 25, 1981
    Date of Patent: November 16, 1982
    Assignees: Copyer Co., Ltd., Canon Inc.
    Inventors: Kazuharu Katagiri, Katsunori Watanabe, Shigeto Ohta, Shozo Ishikawa, Makoto Kitahara
  • Photoconductive composition with 5-nitrofurfural derivative sensitizer
    Patent number: 4358521
    Abstract: Photoconductive compositions and electrophotographic photoreceptive materials are described containing a photo-conductive substance and a 5-nitrofurfural derivative represented by formula (1) ##STR1## wherein A represents atoms which form, together with the carbon atom, a moiety represented by one of formulae (2) to (10) ##STR2## wherein R represents a straight or branched chain alkyl group containing from 1 to 12 carbon atoms, X represents a group having a Hammett .sigma. value of at least 0.
    Type: Grant
    Filed: May 8, 1981
    Date of Patent: November 9, 1982
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Syunichi Kondo, Hirotsugu Nomaguchi, Hideo Sato
  • Photoconductive plate for printing and a method for the preparation of a printing plate by heating
    Patent number: 4357403
    Abstract: A photoconductive plate for printing use having imaged and non-imaged portions. The plate comprises an electroconductive support and a photoconductive layer including a photoconductive material comprising an organic photoconductive pigment and a binder comprising an alkaline soluble phenol resin. The photoconductive plate is subjected to heat treatment at a sufficiently elevated temperature prior to removal of portions of the photoconductive layer so that at least 80% by volume of the non-imaged portion of the photoconductive layer is removed when the photoconductive plate is subjected to treatment with a removing solution. A method for preparing a printing plate. An image is formed on a photoconductive layer and the non-imaged portion of the photoconductive layer is removed by treating the layer with a removing solution.
    Type: Grant
    Filed: August 7, 1980
    Date of Patent: November 2, 1982
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Fumio Shimada, Kinu Hiruma
  • Method of making .alpha.-silicon powder, and electrophotographic materials incorporating said powder
    Patent number: 4356246
    Abstract: A noncrystalline silicon powder having excellent photoconductivity is described, comprising silicon and hydrogen, exhibiting an infrared absorption spectrum characterized by absorption peaks centered at about 2000 cm.sup.-1 and 630 cm.sup.-1, wherein the height of the absorbance peak at 2000 cm.sup.-1 is at least one-tenth the height of the peak centered at 630 cm.sup.-1, and exhibiting a spin density of not more than 10.sup.18 cm.sup.-3 determined by electron spin resonance spectroscopy; the noncrystalline silicon powder is used as highly efficient photoconductor in photoconductive compositions utilized for the production of electrophotographic photoreceptors.
    Type: Grant
    Filed: June 16, 1980
    Date of Patent: October 26, 1982
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Masatoshi Tabei, Keiji Takeda, Kazuhiro Kawaziri, Akio Higashi
  • Electrophotographic media with benzoxazole group containing dis-azo compound
    Patent number: 4356243
    Abstract: An electrophotographic light-sensitive medium is described comprising at least an electrically conductive layer, a charge generation layer and a charge transport layer, the charge generation layer containing a dis-azo compound represented by Formula (1) ##STR1## wherein A is a coupler having aromatic properties, and B is a group selected from hydrogen, halogen, lower alkyl having 1 to 4 carbon atoms and lower alkoxy having 1 to 4 carbon atoms.
    Type: Grant
    Filed: February 19, 1981
    Date of Patent: October 26, 1982
    Assignee: Copyer Co., Ltd.
    Inventors: Shozo Ishikawa, Kazuharu Katagiri, Katsunori Watanabe, Shigeto Ohta, Makoto Kitahara
  • Polyethylene pressure fixable electroscopic printing powder and pressure fixing method
    Patent number: 4355088
    Abstract: A pressure fixable toner for electrostatic image development, which can be fixed upon a receiving member by pressure, is formulated with a high density, low molecular weight polyolefin, one or more coloring agents, and optionally, other adjuvants.
    Type: Grant
    Filed: April 23, 1979
    Date of Patent: October 19, 1982
    Assignee: Am International, Inc.
    Inventors: Virgil W. Westdale, John Novotny, Jr.
  • Process for producing a photoconductive polyimide coating upon a substrate
    Patent number: 4355089
    Abstract: A photoconductive layer is produced upon a substrate by coating the substrate with a solution in an organic solvent of a polyamic acid and of 2,4,7-trinitro-9-fluorenone (TNF) and/or 2,3,4,7-tetranitro-9-fluorenone and heating the coated substrate at a temperature not exceeding 150.degree. C. to form on the substrate a polyimide coating containing the said fluorenone compound as a photosensitizer.
    Type: Grant
    Filed: August 8, 1978
    Date of Patent: October 19, 1982
    Assignee: Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Ten Behoeve Van Nijverheid, Handel En Verkeer
    Inventors: Jan van Turnhout, Ramesh C. Ahuja
  • Method and apparatus for electrostatically charging a dielectric layer
    Patent number: 4353970
    Abstract: A method and an apparatus for charging a dielectric layer electrostatically to a predetermined potential. An AC electrode is arranged at a distance from the dielectric layer and connected to one output of an AC voltage generator. The AC voltage generator has the other output connected to an output of a DC voltage generator. Between the AC electrode and the dielectric layer there is a DC electrode which is connected to the other output of the AC voltage generator. The dielectric layer rests on a counter-electrode which is connected to the other output of the DC voltage generator and is at ground potential. Each of the electrodes can comprise one or a plurality of mutually insulated single electrodes.
    Type: Grant
    Filed: November 8, 1979
    Date of Patent: October 12, 1982
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Kurt Dryczynski, Gunther Schadlich, Roland Moraw
  • Electrophotographic process
    Patent number: 4350750
    Abstract: Either a single copy or a plurality of copies of an original document may be made. Making a single copy or the last copy of a plurality of copies comprises, during a first revolution of a photoconductive drum, electrostatically charging the drum, radiating a light image of the document onto the drum to form an electrostatic image, developing the electrostatic image using a magnetic brush to form a toner image, transferring the toner image to a copy sheet, electrostatically discharging the drum and uniformly radiating the drum with light to further discharge the same. During a second revolution of the drum the drum is cleaned with the same magnetic brush to remove residual toner, and again electrostatically discharged and uniformly radiated. During a third revolution of the drum the magnetic brush is again used for cleaning.
    Type: Grant
    Filed: August 14, 1980
    Date of Patent: September 21, 1982
    Assignee: Ricoh Company, Ltd.
    Inventors: Shigeru Suzuki, Minoru Suzuki, Koichi Suzuki, Kyoji Omi, Yasumori Nagahara, Yoshiharu Kagari, Makoto Hashimoto, Goro Mori
  • High resolution heterogeneous photoconductive compositions and method of preparing
    Patent number: 4350751
    Abstract: A plurality of aggregate photoconductive particles having a predominant particle size of less than about 1.0 micron are disclosed. Such particles are useful in heterogeneous photoconductive compositions, electrophotographic elements and electrophotographic imaging processes.
    Type: Grant
    Filed: July 6, 1981
    Date of Patent: September 21, 1982
    Assignee: Eastman Kodak Company
    Inventor: Lawrence E. Contois
  • Disazo pigment containing electrophotographic element
    Patent number: 4349616
    Abstract: An electrophotographic element comprising an electrically conductive substrate and a monolayer or multilayer type photo-sensitive layer, superposed thereon, containing as an effective ingredient a disazo pigment having the general formula (I): ##STR1## wherein Ar.sup.1 and Ar.sup.2 each represent a phenylene group. However, when Ar.sup.1 is 1,4-phenylene group Ar.sup.2 is 1,2- or 1,3-phenylene group; when Ar.sup.1 is 1,3-phenylene group Ar.sup.2 may be any one of 1,2-, 1,3- and 1,4-phenylene groups; and when Ar.sup.1 is 1,2-phenylene group Ar.sup.2 is 1,3-phenylene group. X represents aromatic rings such as benzene ring, naphthalene ring and the like, hetero rings such as indole ring, carbazole ring, benzofuran ring and the like or their substitution products; Ar.sup.
    Type: Grant
    Filed: December 19, 1980
    Date of Patent: September 14, 1982
    Assignee: Ricoh Co., Ltd.
    Inventor: Masaomi Sasaki
  • Function separated type electrophotographic light-sensitive members and process for production thereof
    Patent number: 4349617
    Abstract: A function separated type electrophotographic light-sensitive member and a process for production thereof are described, said member comprising an electrically conductive support, a light-sensitive layer made of a hydrogen-doped amorphous silicon semiconductor, and an organic electric charge transport layer containing at least one positive charge transport carrier selected from the group consisting of pyrazolines, aryl-alkanes, arylketones, arylamines and chalcones.
    Type: Grant
    Filed: October 23, 1980
    Date of Patent: September 14, 1982
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kazuhiro Kawashiri, Yuzo Mizobuchi, Akio Higashi, Hiroshi Tamura, Keiji Takeda, Masayoshi Nagata
  • Electrophotographic method and element
    Patent number: 4347297
    Abstract: An electrophotographic method for color image formation, wherein use is made of an electrophotographic photosensitive member having a multitude of isolated electrically conductive members for forming image elements, a photoconductive layer, and a multitude of sets of electrodes for determining an electric potential of the isolated electrically conductive members in correspondence to a color image original, each set of electrodes comprising a non-transparent electrode, a transparent electrode, and color filter electrodes, and wherein a voltage is applied across the electrodes followed by development.
    Type: Grant
    Filed: November 5, 1980
    Date of Patent: August 31, 1982
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shunichi Ishihara, Nobuo Kitajima, Yuji Nishigaki, Nobuko Kitahara
  • Electrophotographic photosensitive member and electrophotographic process
    Patent number: 4347296
    Abstract: An electrophotographic photosensitive member comprises isolated conductive members forming picture elements, a photoconductive layer, transparent electrodes and color filter electrodes.
    Type: Grant
    Filed: October 28, 1980
    Date of Patent: August 31, 1982
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shunichi Ishihara, Nobuo Kitajima, Yuji Nishigaki, Nobuko Kitahara
  • Electrophotographic bisazo photoconductor
    Patent number: 4343882
    Abstract: An electrophotographic photoconductor comprising, on an electroconductive support material, a photoconductive layer containing a bisazo pigment having a phenanthrenequinone substituent, which electrophotographic photoconductor exhibits relatively high photosensitivity and usefullness for electrophotographic copying.
    Type: Grant
    Filed: March 18, 1981
    Date of Patent: August 10, 1982
    Assignee: Ricoh Company, Ltd.
    Inventor: Mitsuru Hashimoto
  • Polycyanoanthracenes and use as sensitizers for electrophotographic compositions
    Patent number: 4341852
    Abstract: Polycyanoanthracenes containing three or more cyano groups, and in particular the novel compound 2,6,9,10-tetracyanoanthracene, are sensitizers for organic photoconductors.
    Type: Grant
    Filed: October 2, 1980
    Date of Patent: July 27, 1982
    Assignee: Eastman Kodak Company
    Inventors: Susan L. Mattes, Samir Y. Farid
  • Laminated ZnO photosensitive material
    Patent number: 4340658
    Abstract: Disclosed is a laminated photosensitive material for electrophotography, which comprises a conductive substrate, an undercoat layer formed of a composition comprising a resin binder having no substantial photoconductivity and photoconductive zinc oxide in an amount of 1 to 20 parts by weight per part by weight of the resin binder, an intermediate layer formed of a composition comprising a polyvinyl carbazole type photoconductor and photoconductive zinc oxide in an amount of 1 to 20 parts by weight per part by weight of the photoconductor and a topcoat layer comprised of a polyvinyl carbazole type photoconductor.This laminated photosensitive material has a very high sensitivity and a high initial charge voltage in combination and provides an image having a high density and a high contrast.
    Type: Grant
    Filed: March 4, 1981
    Date of Patent: July 20, 1982
    Assignee: Mita Industrial Co., Ltd.
    Inventors: Eiichi Inoue, Isamu Shimizu
  • Electrographic developing composition and process
    Patent number: RE31072
    Abstract: The present invention relates to an electrographic developing composition containing finely divided carrier particles and finely divided toner particles having incorporated therein a fusible, crosslinked binder polymer. An improved electrographic developing process using such toner particles is also disclosed.
    Type: Grant
    Filed: January 28, 1977
    Date of Patent: November 2, 1982
    Assignee: Eastman Kodak Company
    Inventors: Thomas A. Jadwin, Ravi Khanna, Stewart H. Merrill, Edmond S. Perry