Patents Examined by Roland E. Martin
  • Patent number: 5019472
    Abstract: A method for electrostatically producing prepress printing proofs that accurately predict results of actual press runs for a given press having known or desired characteristic response.
    Type: Grant
    Filed: September 12, 1988
    Date of Patent: May 28, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Kerin S. Benack, Arthur J. Taggi
  • Patent number: 5011758
    Abstract: A method of using a liquid electrophotographic toner with a permanent master to electrostatically transfer a electrophotographically developed electrostatic image via a reversal photographic process from the permanent master to a receiving surface is disclosed. The permanent master is made from a multilayer plate of a photopolymer material and a protective overcoated material whose surface is hard, low friction and acts as a physical and chemical barrier.
    Type: Grant
    Filed: July 31, 1989
    Date of Patent: April 30, 1991
    Assignee: Olin Hunt Specialty Products Inc.
    Inventors: Robert H. Detig, David P. Bujese
  • Patent number: 5001028
    Abstract: A multicolor reproduction is made by uniformly charging a photoconductive member, imagewise exposing that member to create a first electrostatic image, developing the first electrostatic image with a toner of a first color to create a first toner image, preferably uniformly recharging the photoconductive member, imagewise exposing the charged member creating a second electrostatic image, developing the second electrostatic image by the application of toner of a second color to the exposed areas. The process can be repeated for any number of colors. The multicolor image is then transferred in a single step to a receiving sheet. The second and subsequent development steps are carried out by a magnetic brush developing device employing hard magnetic carrier particles that are tumbled through a development zone which tumbling does not adversely affect the prior toner images.
    Type: Grant
    Filed: July 28, 1989
    Date of Patent: March 19, 1991
    Assignee: Eastman Kodak Company
    Inventors: Michael Mosehauer, Yee S. Ng, Eric K. Zeise
  • Patent number: 4987044
    Abstract: A radiation beam used for selectively exposing a surface is moved in a helical path by means of two oscillating mirrors vibrating about axes that are mutually perpendicular. By maintaining a constant product for oscillating frequency and rotational oscillatory mirror deflection, the level of exposure can be made substantially constant.
    Type: Grant
    Filed: May 31, 1989
    Date of Patent: January 22, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Eustathios Vassiliou
  • Patent number: 4983481
    Abstract: An imaging member having a flexible supporting substrate layer, an electrically conductive layer, an optional adhesive layer, a charge generator layer and a change transport layer, the supporting layer having a thermal contraction coefficient substantially identical to the thermal contraction coefficient the charge transport layer. This imaging member may be employed in an electrostatographic imaging process.
    Type: Grant
    Filed: January 3, 1989
    Date of Patent: January 8, 1991
    Assignee: Xerox Corporation
    Inventor: Robert C. U. Yu
  • Patent number: 4980257
    Abstract: In an electrostatic latent image developing toner which comprises spherical core particles composed of at least a coloring agent and a thermoplastic resin and an outer shell layer containing at least a thermoplastic resin and applied in the form of a coating fast to the core particles, the outer shell layer applied in the form of a coating is formed by (a) thermally fixing minute particles of one thermoplastic resin and minute particles of another thermoplastic resin on the surface of the core particles thereby enabling part of the aforementioned other thermoplastic resin to retain the original particulate form thereof intact in the produced coating or (b) thermally fixing minute particles of a thermoplastic resin and minute particles of a thermosetting resin or minute particles of a resin possessing a gelling component in a specific amount on the surface of the core particles thereby enabling the minute particles of the resin to retain the original particulate form thereon intact in the produced coating and
    Type: Grant
    Filed: January 26, 1989
    Date of Patent: December 25, 1990
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Masahiro Anno, Junji Machida, Eiichi Sano
  • Patent number: 4980253
    Abstract: An object of the invention is to provide a copy machine for recording an additional information onto a copy of document without reducing the document original image. The copy machine has a display for indicating the additional information in the proximity of a glass platen for placing the document. The copy machine is adapted to perform copy operation at least two times so as to form both copy images of the document and the additional information on the same copy sheet.
    Type: Grant
    Filed: November 21, 1989
    Date of Patent: December 25, 1990
    Assignee: Konica Corporation
    Inventor: Seitaro Kasahara
  • Patent number: 4978598
    Abstract: Liquid toners for developing electrophotographic images contain dispersed toner particles which are based on a polymer with multi-characteristics. These particles comprise a thermoplastic resinous core with a T.sub.g below room temperature, which is chemically anchored to an amphipathic copolymer steric stabilizer containing covalently attached groups of a coordinating compound which in turn are capable of forming covalent links with organo-metallic charge directing compounds. The toner particles so formed have advantageous properties of high charge/mass, and good charge and dispersion stability.
    Type: Grant
    Filed: March 8, 1990
    Date of Patent: December 18, 1990
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Mohamed A. Elmasry, Kevin M. Kidnie
  • Patent number: 4977051
    Abstract: An electrophotographic photoreceptor is disclosed, which comprises an electrically conductive support having thereon a layer which contains a charge carrier transporting compound and a charge carrier generating compound, or a layer which contains charge carrier transporting compound and a layer which contains a charge generating compound, wherein at least one type of tris-azo compound represented by formula (I) is included as a charge carrier generating compound: ##STR1## wherein Ar.sub.1, Ar.sub.2, Ar.sub.3, Ar.sub.4 and A are as defined in the specification.
    Type: Grant
    Filed: November 8, 1989
    Date of Patent: December 11, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shigeru Ohno, Katsuji Kitatani, Naonori Makino, Satoshi Hoshi, Hideo Sato
  • Patent number: 4977050
    Abstract: The present invention relates to an electrophotographic sensitive member, in particular to an electrophotographic sensitive member capable of enhancing a photosensitivity on both a short wavelength side and a long wavelength side and a charge acceptance and thus suitable for a plain paper copying machine (PPC).The stabilized operation characteristics and durability have been required for an electrophotographic sensitive member drum carried on instruments such as high-speed copying machine and laser beam printer.Amorphous silicon has been watched with interest for this requirement in view of superior abrasion resistance, heat resistance, antipollution property, photosensitivity characteristic and the like.However, such the amorphous silicon photosensitive member shows the higher photosensitivity on the long wavelength side.
    Type: Grant
    Filed: December 21, 1988
    Date of Patent: December 11, 1990
    Assignee: Kyocera Corporation
    Inventors: Takao Kawamura, Naooki Miyamoto, Hiroshi Ito, Hitoshi Takemura, Kokichi Ishibutsu
  • Patent number: 4977053
    Abstract: Disclosured is a toner comprising colored particles and a magnetic shell coated thereon, wherein said colored particles are composed of a binder resin and a coloring agent, and said magnetic shell is formed from an iron-oxide type magnetic material. The toner can be fixable at a low temperature or a low pressure, but the toner particles do not agglomerate with each other during long-term storage.
    Type: Grant
    Filed: September 29, 1989
    Date of Patent: December 11, 1990
    Assignee: Nippon Paint Co., Ltd.
    Inventors: Masao Ohishi, Katsuaki Kida, Katsukiyo Ishikawa, Takao Saito, Kouichi Nagata
  • Patent number: 4973538
    Abstract: A toner for development of a latent electrostatic image containing a colorant and a binder resin formed of a mixture of a low-molecular weight component and a high-molecular weight component. Both the low-molecular weight component and high-molecular weight component are made from a styrene-acrylic copolymer where the weight ratio (A) of styrene to acrylic monomer in the low-molecular weight polymer component and an the weight ratio (B) of styrene to acrylic monomer in the high-molecular weight polymer component satisfies the relationship A/B.ltoreq.1.3. The mixing ratio of the low-molecular weight and high-molecular weight components is within the range of from 80:20 to 40:60. The weight-average molecular weight (Mw) and the number-average molecular weight (Mn) of the low-molecular weight polymer component satisfies the relationship Mw/Mn.ltoreq.3.0.
    Type: Grant
    Filed: February 9, 1989
    Date of Patent: November 27, 1990
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Chiaki Suzuki, Masayoshi Shinoki, Koichi Kumashiro, Sueko Sakai, Emi Takahashi
  • Patent number: 4971875
    Abstract: An organic photoconductor comprising an electrically conducting support, a charge generation layer containing dibromoanthanthrone and a charge transport layer containing a di- or triarylmethane compound of the formula: ##STR1## wherein R.sup.1 represents hydrogen or an optionally substituted alkyl, alkenyl, cycloalkyl, cycloalkenyl, aralkyl or aryl radical;each of R.sup.2, R.sup.3, R.sup.4 and R.sup.5, independently, represent hydrogen or an optionally substituted alkyl, alkenyl, cycloalkyl, aralkyl or aryl radical, or R.sup.2 and R.sup.3 together with the attached nitrogen atom and R.sup.4 and R.sup.5 together with the attached nitrogen atom may form heterocyclic rings; andeach of R.sup.6, R.sup.7, R.sup.8 and R.sup.
    Type: Grant
    Filed: May 4, 1989
    Date of Patent: November 20, 1990
    Assignee: Imperial Chemical Industries Plc
    Inventors: Peter Gregory, Prahalad M. Mistry
  • Patent number: 4971872
    Abstract: A printing member for electrostatic photocopying, comprises a substrate having a conductive surface and a photoelectric-sensitive, electrically chargeable layer deposited on the conductive surface of the substrate. The electrically chargeable layer has a non-single crystal semiconductor layer having a build-in-potential, or the non-single crystal semiconductor layer and an insulating or semi-insulating layer.
    Type: Grant
    Filed: August 21, 1989
    Date of Patent: November 20, 1990
    Inventor: Shunpei Yamazaki
  • Patent number: 4971882
    Abstract: A toner composition comprised of resin particles, pigment particles, charge enhancing additive, and a mixture of a charge enhancing additive and a wax component comprised of an alkylene, or polymeric alcohol of the formulaCH.sub.3 (CH.sub.2).sub.n CH.sub.2 OHwherein n is a number of from about 30 to about 300.
    Type: Grant
    Filed: December 22, 1988
    Date of Patent: November 20, 1990
    Assignee: Xerox Corporation
    Inventor: Don B. Jugle
  • Patent number: 4971873
    Abstract: A photoconductor element which employs a solvent soluble polyimide as the polymeric binder in at least one layer thereof. The polyimide is characterized by the formula: ##STR1## where R is a dianhydride and n is an integer in the range of 50 to 450.
    Type: Grant
    Filed: October 30, 1989
    Date of Patent: November 20, 1990
    Assignee: Eastman Kodak Company
    Inventors: Joseph A. Pavlisko, William J. Staudenmayer
  • Patent number: 4968572
    Abstract: An electrophotographic photoreceptor comprising a support having provided thereon at least one photoconductive layer containing at least an inorganic photoconductive substance and a binder resin is disclosed, wherein said binder resin contains (A) a resin having at least one kind of acidic group selected from the group consisting of --PO.sub.3 H.sub.2, --SO.sub.3 H, and --COOH at the terminal end of the main chain of the resin. The photoreceptor exhibits excellent electrostatic characteristics, image formation performance as well as printing suitability irrespective of change in environmental condition or the kind of sensitizing dyes to be used in combination with the photoreceptor.
    Type: Grant
    Filed: September 8, 1988
    Date of Patent: November 6, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii
  • Patent number: 4968576
    Abstract: Resinous microparticles useful in toner for electrophotography which are made of vinyl resin obtained by emulsion polymerization of at least one .alpha.,.beta.-ethylenically unsaturated monomers in the presence of cationic surfactant having an onium salt structure and a polymerization initiator having an amidine or amidine salt structure and whose average particle diameter is in a range of from 0.01 to 1.mu., and toner composition comprising toner particles and resinous microparticles as abovementioned are provided.
    Type: Grant
    Filed: January 17, 1989
    Date of Patent: November 6, 1990
    Assignee: Nippon Paint Co., Ltd.
    Inventors: Masayuki Maruta, Katsuaki Kida, Eio Hisajima, Akio Kashihara, Naoya Yabuuchi
  • Patent number: 4968571
    Abstract: An electrophotographic recording element comprising a combination of photoconductive perylene materials that are dispersed in a binder to form layers having excellent photosensitivity and resistance to abrasion. The materials are perylene-3,4,9,10-tetracarboxylic acid imide derivatives that contain a phenethyl radical bonded to a 3,4-dicarboximide nitrogen atom.
    Type: Grant
    Filed: July 21, 1989
    Date of Patent: November 6, 1990
    Assignee: Eastman Kodak Company
    Inventors: William T. Gruenbaum, Khe C. Nguyen, Jeanne E. Kaeding
  • Patent number: 4968575
    Abstract: There are provided binder resins for use in toner compositions which comprise, as the main component thereof, a terminally blocked polyester in which the terminal hydroxyl groups of polyester polyol molecules are blocked by a rosin compound selected from the group consisting of rosin, hydrogenated rosin and disproportionated rosin and which has an acid value of not more than 4 KOH mg/g and a hydroxyl value of not more than 20 KOH mg/g as well as toner compositions comprising them in combination of a coloring agent and a charge control agent.
    Type: Grant
    Filed: July 19, 1988
    Date of Patent: November 6, 1990
    Assignee: Nippon Gohsei Kagaku Kogyo Kabushiki Kaisha
    Inventors: Akira Matsumura, Tomiji Itou, Toshiyuki Kusuda, Sadao Shigematsu