Ring Containing Organic Compound Patents (Class 96/13)
  • Patent number: 5409524
    Abstract: The invention is a process for obtaining membranes having improved selectivity and recovery using a combination of heat treating and UV irradiation.
    Type: Grant
    Filed: September 10, 1993
    Date of Patent: April 25, 1995
    Assignee: The Dow Chemical Company
    Inventors: John A. Jensvold, Srikanth R. Chary, Wendy S. Jacks, Hans R. Keller, Theodore L. Parker, Damoder Reddy
  • Patent number: 5364454
    Abstract: The present invention relates to fluid separation composite membranes prepared from sulfonated aromatic polymers in lithium salt form with sulfonic acid groups attached to aromatic rings that are incorporated into the main polymeric backbone.
    Type: Grant
    Filed: June 30, 1993
    Date of Patent: November 15, 1994
    Assignee: Praxair Technology, Inc.
    Inventors: Benjamin Bikson, Joyce K. Nelson
  • Patent number: 5356459
    Abstract: Multilayer composite membranes are produced in a one-step coating process that provides an interior gas separation layer and an external defect sealing layer.
    Type: Grant
    Filed: June 30, 1993
    Date of Patent: October 18, 1994
    Assignee: Praxair Technology, Inc.
    Inventors: Benjamin Bikson, Joyce K. Nelson
  • Patent number: 5356461
    Abstract: A multilayer membrane for separating gas mixtures includes a polymer supporting membrane with a voids volume of more than 50% and a coating of two or more separating layers made of two or more different polymers. A hollow capillary serving as the supporting membrane is guided through the central bore of a spinneret. The spinneret has one or several concentric annular slits and/or annular grooves, through each of which a solution of one of the polymers forming the separating layers is applied to the supporting membrane. The spinneret terminates in a sealed chamber in which the solvent or solvents of the polymer solutions is/are evaporated and removed. The coated supporting membrane is drawn out of the chamber and wound up, possibly following aftertreatment with heat and/or liquids.
    Type: Grant
    Filed: March 30, 1993
    Date of Patent: October 18, 1994
    Assignee: Akzo N.V.
    Inventors: Heinz-Dieter Sluma, Robert Weinzenhofer, Alfons Leeb, Karl Bauer
  • Patent number: 5348569
    Abstract: The present invention relates to composite membranes and membranes which are formed from modified poly(phenylene oxide) polymers having improved film forming properties and separation characteristics. The present invention further relates to poly(phenylene oxide) polymer and modified poly(phenylene oxide) polymer, having improved membrane forming characteristics and processes for producing the same.
    Type: Grant
    Filed: June 30, 1993
    Date of Patent: September 20, 1994
    Assignee: Praxair Technology, Inc.
    Inventors: Benjamin Bikson, Gertrud Gotz, Yurdagul Ozcayir, Joyce K. Nelson
  • Patent number: 5342434
    Abstract: A gas permeable material having continuous pores through it, in which the pore interiors are coated with a coating composition of the formula: ##STR1## wherein B is selected from the class consisting of ##STR2## and R is (--CH.sub.2 --).sub.x wherein x is a cardinal number of 1-4;Y i s C.sub.n F.sub.2n+1 or ##STR3## where n is a cardinal number of 3-20 and R.sup.1 is H or alkyl of 1-4 carbon.
    Type: Grant
    Filed: July 30, 1993
    Date of Patent: August 30, 1994
    Assignee: W. L. Gore & Associates, Inc.
    Inventor: Huey S. Wu
  • Patent number: 5342432
    Abstract: Composite membrane, process for its production and its useA composite membrane for gas separation having a three-layer structure, constructed fromA) a supporting membrane layer made of porous polymer,B) a nonporous, gas-permeable intermediate layer,C) a permselective layer of regularly arranged organic molecules having a layer thickness of 3 to 100 nm,the layers (A) and (C) enclosing the intermediate layer (B), wherein the permselective layer (C) is constructed from regularly arranged amphiphilic molecules which contain one or two alkyl chains each having 7 to 25 carbon atoms per polar hydrophilic group.
    Type: Grant
    Filed: July 2, 1994
    Date of Patent: August 30, 1994
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Michael Haubs, Werner Prass
  • Patent number: 5288304
    Abstract: The invention provides carbon membranes for use in fluid separation processes, particularly gas separations, which are treated with a coating that provides a protective barrier which significantly limits permeation of water vapor or other impurities such as hydrocarbons without significantly inhibiting permeation of the faster fluid component or lowering selectivity. The composite membranes retain good fluid separation properties and are resistant to the adverse effects on membrane performance commonly observed in environments having high humidity. The coating is preferably an amorphous polymer of perfluoro-2,2-dimethyl-1,3-dioxole. The membranes can be of a varied configuration: sheet form, hollow fiber, asymmetrical membranes and the like.
    Type: Grant
    Filed: March 30, 1993
    Date of Patent: February 22, 1994
    Assignee: The University of Texas System
    Inventors: William J. Koros, Cheryl W. Jones
  • Patent number: 5286539
    Abstract: A gas separating asymmetric membrane such as a gas separating asymmetric hollow fiber comprises an aromatic polyimide comprising recurring units of the formulae (I) and (II): ##STR1## wherein A.sup.1 is a tetravalent unit having a diphenylhexafluoropropane structure, A.sup.2 is a tetravalent unit having a benzene structure, and A.sup.3 is a divalent aromatic unit which is a unit derived from a sulfur atom-containing diamine such as diaminodibenzothiophene, diaminodiphenylenesulfone, diaminothioxanthene-5,5-dioxide or diaminothioxanthone-5,5-dioxide. The aromatic polyimide contains the recurring unit of the formula (I) in an amount of 40 to 90 molar % and the recurring unit of the formula (II) in an amount of 10 to 40 molar %. Further, a process for the preparation of the gas separating asymmetric hollow fiber membrane is also disclosed.
    Type: Grant
    Filed: September 9, 1992
    Date of Patent: February 15, 1994
    Assignee: Ube Industries, Ltd.
    Inventors: Yoshihiro Kusuki, Toshimune Yoshinaga, Harutoshi Hoshino, Shinji Asanuma
  • Patent number: 5286280
    Abstract: This invention provides a composite gas separation membrane comprising: (a) a porous polyacrylonitrile structural support material having a polyacrylonitrile surface; (b) a gutter layer coating comprising a crosslinked polar phenyl-containing-organopolysiloxane material on the polyacrylonitrile surface of the structural support material, leaving an uncoated gutter layer surface; and (c) an ultrathin 6FDA type polyimide selective membrane layer coating on the uncoated gutter layer surface. In preferred embodiments, the phenyl-containing-organopolysiloxane material additionally comprises a silica-sol. Processes for making the composite gas separation membrane and for using the membrane to carry out gas separations are also provided.
    Type: Grant
    Filed: December 31, 1992
    Date of Patent: February 15, 1994
    Assignee: Hoechst Celanese Corporation
    Inventor: Jeffrey J. Chiou
  • Patent number: 5238471
    Abstract: Disclosed is a process for preparing gas separation membranes wherein a thin film of an amorphous fluoropolymer is spray-deposited as an aerosol onto a microporous substrate and rendered substantially continuous or defect-free by thermal and/or chemical treatment.
    Type: Grant
    Filed: October 14, 1992
    Date of Patent: August 24, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Graciela B. Blanchet-Fincher
  • Patent number: 5238569
    Abstract: A membrane for a filter device or a device for gas or liquid separation, the membrane being constituted by a porous structure made of at least one material selected from sintered ceramic, sintered metals, microporous carbon, microporous glass, and polymers, said structure including at least one microporous layer, wherein the entire outside surface and inside surface of the pores of said structure is covered by a thin and continuous film of a polyphosphazene, the thickness of said film lying in the range 0.01% to 10% of the mean diameter of the pores of said microporous layer.
    Type: Grant
    Filed: July 24, 1992
    Date of Patent: August 24, 1993
    Assignee: Societe des Ceramiques Techniques
    Inventors: Raymond Soria, Corinne Defalque, Jacques Gillot
  • Patent number: 4167326
    Abstract: A method and apparatus is described by which photocopies can be obtained from documents and the like without the need for optical means for forming focused images of the documents.
    Type: Grant
    Filed: December 29, 1977
    Date of Patent: September 11, 1979
    Inventor: John M. Payne
  • Patent number: 4166740
    Abstract: Electrophotosensitive materials having the structure ##STR1## wherein: A AND B REPRESENT ZERO, ONE OR TWO;L.sup.1 through L.sup.7, which may be the same or different represent hydrogen, alkyl, aralkyl, aryl or dialkylaminoarylvinyl; or any two of L.sup.1, L.sup.2, and L.sup.3 or any two of L.sup.4, L.sup.5, L.sup.6 and L.sup.7 may, together with the atoms to which they are attached, represent the elements needed to complete a carbocyclic ring;R represents alkyl, aryl, nitroaryl or hydrogen;A.sup.1 represents aryl or a heterocyclic nucleus including those nuclei defined for A.sup.2 below;A.sup.2 represents a N-alkyl substituted nucleus of the type used in cyanine dyes.
    Type: Grant
    Filed: July 3, 1978
    Date of Patent: September 4, 1979
    Assignee: Eastman Kodak Company
    Inventors: Frank G. Webster, Michael T. Regan
  • 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: 4165985
    Abstract: Electrophotosensitive materials having the structure ##STR1## wherein R represents a basic heterocyclic nucleus as well as groups such as hydrogen, alkyl, aryl, aralkyl, etc.;A.sub.1 represents a wide variety of basic heterocyclic nuclei;A.sub.2 represents aryl or may be the same as A.sub.1 ;G represents O or S;M is 0 to 3;N is 0 to 1; andL.sup.1, l.sup.2, l.sup.3, l.sup.4 and L.sup.5 represent hydrogen, alkyl or aryl.
    Type: Grant
    Filed: May 24, 1978
    Date of Patent: August 28, 1979
    Assignee: Eastman Kodak Company
    Inventors: James R. Nonnemacher, Michael T. Regan, Frank G. Webster
  • Patent number: 4142890
    Abstract: Trans-epindolidione is a useful yellow material in forming photoelectrophoretic migration images.
    Type: Grant
    Filed: December 5, 1977
    Date of Patent: March 6, 1979
    Assignee: Eastman Kodak Company
    Inventors: Melvin S. Bloom, Michael T. Regan
  • Patent number: 4142889
    Abstract: In an electrophotographic process in which a photosensitive member such as CdS.nCdCO.sub.3 -resin photosensitive member having peculiar hysteresis characteristics is sequentially subjected to pre-charging step, hysteresis charging step, hysteresis exposure step, charging step and image-wise light exposure step, the adjustment of photosensitivity of the photosensitive member by variation of the amount of light in the hysteresis exposure step results in an improvement in image formation.
    Type: Grant
    Filed: December 2, 1977
    Date of Patent: March 6, 1979
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Susumu Tanaka, Takashi Sugiyama, Kuniki Seino, Shoji Kondo
  • Patent number: 4141728
    Abstract: An improved method of transferring an electrostatically developed image from a photoreceptor to a transfer member (e.g., a sheet of paper) in contact with the image including simultaneously (1) charging the transfer member to a polarity opposite to that of the toner forming the developed image, (2) exposing a photoconductive surface of the photoreceptor to light, and (3) charging the photoconductive surface to the same polarity as that of the toner particles.
    Type: Grant
    Filed: July 5, 1977
    Date of Patent: February 27, 1979
    Assignee: Xerox Corporation
    Inventor: Kent W. Hemphill
  • Patent number: 4130359
    Abstract: Electrophoretic migration imaging apparatus and method of the type using electrophotosensitive pigment particles are improved, e.g., as to image density and background, by providing an enlarged migration environment for the imaged electrode. In one embodiment the non-imaged electrode and pigment dispersion thereon are moved predeterminedly, in direction and rate, so as to supplant non-imaged electrode surface and dispersion presented to imaged electrode portions during each successive imaging sequence.
    Type: Grant
    Filed: June 9, 1977
    Date of Patent: December 19, 1978
    Assignee: Eastman Kodak Company
    Inventor: Carl F. Groner
  • Patent number: 4106409
    Abstract: In an electrostatic printing process utilizing a printing master formed by exposing and heat developing a photosensitive element formed from a reducible organic silver salt, image forming capability is enhanced by a preheating of the image-forming member prior to said exposure and heat developing of the exposed image.
    Type: Grant
    Filed: January 21, 1977
    Date of Patent: August 15, 1978
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hajime Kobayashi, Yasuhiro Yano, Ichiro Endo
  • Patent number: 4104064
    Abstract: There are described novel yellow compounds which are represented by the formula ##STR1## wherein X is a member selected from the group consisting of ##STR2## The compounds may be used for various applications and preferably are utilized as imaging particles in the photoelectrophoretic imaging method.
    Type: Grant
    Filed: October 15, 1976
    Date of Patent: August 1, 1978
    Assignee: Xerox Corporation
    Inventor: Robert J. Gruber
  • Patent number: 4101320
    Abstract: A magnetic imaging system is disclosed wherein an optical image is first reduced to a graphic image by employing a magnetizable marking material followed by magnetization of the graphic image and transfer of the imagewise pattern of magnetization to a magnetic substrate to provide a latent magnetic image. The latent magnetic image is utilized for the purpose of image duplicating by successive development and transfer steps or for electronic transmission of information. Improved latent magnetic images are provided by retoning the graphic image after magnetization and further magnetizing the retoned graphic image from which the latent image is produced. Also, polishing the redeveloped graphic image further improves the quality of the latent image.
    Type: Grant
    Filed: December 30, 1974
    Date of Patent: July 18, 1978
    Assignee: Xerox Corporation
    Inventors: Edward C. Sellers, Chandler Malkani
  • Patent number: 4093456
    Abstract: Electrophoretic image generation involving a conductivity pattern and a field produced by electrodes which are shunted in the process of image formation, the shunting being interrupted for a predetermined time to minimize background.
    Type: Grant
    Filed: June 11, 1976
    Date of Patent: June 6, 1978
    Assignee: Konishiroku Photo Ind., Ltd.
    Inventor: Hansjurg Hermann
  • Patent number: 4090876
    Abstract: A process for forming electrostatic latent images to be developed by a color toner. The process comprises steps of electrically charging a photoconductive layer of an ion-beam controlling screen, exposing the photoconductive layer electrically charged to a first image information, disposing a recording medium having a photoconductive layer so as to oppose to the exposed photoconductive layer, and applying ions to the photoconductive layer of the recording medium through the screen to form an electrostatic latent image having a background of charged potential. The photoconductive layer of the recording medium in which the electrostatic latent image is formed is exposed to a second image information to produce a corrected electrostatic latent image.
    Type: Grant
    Filed: July 13, 1977
    Date of Patent: May 23, 1978
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Tutomu Furuya, Shigeru Inowa
  • Patent number: 4078928
    Abstract: There is disclosed a photoelectrophoretic imaging method wherein, after an image is formed on the surface of an electrode, the image is subjected to an electrical field, under darkened conditions, established between the electrode carrying the image and another electrode to enhance the image.
    Type: Grant
    Filed: March 3, 1975
    Date of Patent: March 14, 1978
    Assignee: Xerox Corporation
    Inventor: Carol K. Keller
  • Patent number: 4077803
    Abstract: A method and apparatus are provided for achieving substantially uniform charging of a single layer thermoplastic recording surface in either a positive or negative sense to a potential just below the frost threshold level, for exposing the thermoplastic surface to light in image configuration, and for applying a heat pulse to the thermoplastic surface for a time relatively short compared to the duration of the light exposure interval and during that exposure. The charging event is arranged so that the thermoplastic surface is raised only to a relatively low potential with respect to ground. More specifically, the consequent surface charge density on the thermoplastic surface is of a low enough magnitude that no frost is produced when the medium is cycled without exposure to light; furthermore, the quality of the recording is relatively insensitive to layer thickness.
    Type: Grant
    Filed: December 1, 1975
    Date of Patent: March 7, 1978
    Assignee: Sperry Rand Corporation
    Inventor: Robert L. Gravel
  • Patent number: 4069047
    Abstract: There is disclosed a photoelectrophoretic imaging system wherein a layer of an imaging suspension is arranged between a conductive transparent electrode and a second electrode, preferably a blocking electrode, subjected to an electrical field and exposed to an imagewise pattern of activating electromagnetic radiation to form an image on the transparent electrode which is subsequently transferred to a receiver member and fixed thereto. The conductive transparent electrode comprises a layer of a conductive material overlying a layer of polymeric material which overlies a substrate and is also utilized during the transfer and fixing of the image.
    Type: Grant
    Filed: June 27, 1975
    Date of Patent: January 17, 1978
    Assignee: Xerox Corporation
    Inventors: Luke C. Lin, Morton Schrager
  • Patent number: 4060319
    Abstract: An imaging apparatus including a means for converting graphic indicia into an electrical representations, a source of a coherent beam of optical radiation at a predetermined wavelength, a modulator for controlling the transmissive characteristics of a crystal which modulates the coherent beam in response to the electrical representations, a light deflector for scanning the modulated coherent beam in a scan pattern forming an image on a surface and means for developing the image from the surface and imaging a representation of graphic indicia by controlling the modulation and scanning of a coherent beam of optical radiation in a controlled pattern forming an image on a surface representative of the graphic indicia and developing the image.
    Type: Grant
    Filed: June 20, 1975
    Date of Patent: November 29, 1977
    Inventor: Daniel J. Meaney, Jr.
  • Patent number: 4052208
    Abstract: An image recording medium for recording incident radiation to provide a positive transparency is constructed of two electrically conductive composite layers containing photoconductive material between them. One of the conductive layers is opaque and the other is transparent to the incident radiation. A voltage, sufficient to cause holes to be produced in the opaque conductive layer in response to the incident radiation, is applied between the conductive layers. Various systems for controlling the recording process are described.
    Type: Grant
    Filed: June 5, 1975
    Date of Patent: October 4, 1977
    Inventor: Michael A. Martinelli
  • Patent number: 4047947
    Abstract: Process for preparation of transparencies from a solid phase dispersion of photoconductive particles in an insulating binder matrix. In this process, a dispersion is initially formed from an insulating polymer resin and an organoselenium compound capable of undergoing selective decomposition in response to an appropriate stimulus, whereby elemental selenium is extruded from said organoselenium compound and deposited within the polymeric resin. As a result of this deposition of elemental selenium within the insulating layer, the layer is rendered photoresponsive and can be used in conventional electrophotographic processes. Subsequent to the development and fusion of a developer image on this imaging member, the extrusion/deposition reaction can be reversed and the selenium deposit erased thus leaving a toner image fused to a substantially transparent polymeric film.
    Type: Grant
    Filed: October 23, 1974
    Date of Patent: September 13, 1977
    Assignee: Xerox Corporation
    Inventors: Joseph Y. C. Chu, Wolfgang H. H. Gunther
  • Patent number: 4047944
    Abstract: An improved electrophoretic imaging process is provided wherein the improvement comprises the use of electrostatic charge-bearing particles having an electrically photosensitive pigment which is the reaction product of 2,3-naphthalenediol and a diazonium salt. Preferred pigments have the following structure: ##STR1## wherein: R.sup.1 is a lower alkoxy group or --OCH.sub.2 CONH.sub.2 ;R.sup.2 is H or NO.sub.2 ; andR.sup.3 is H or --SO.sub.2 NH.sub.2.
    Type: Grant
    Filed: December 27, 1976
    Date of Patent: September 13, 1977
    Assignee: Eastman Kodak Company
    Inventors: Louis J. Rossi, Michael T. Regan
  • Patent number: 4045218
    Abstract: A method for color accenting selected portions of a photocopy wherein a photoconductive surface is exposed to a light image of the document being reproduced, the non-selected portions of the resulting latent image are erased prior to developing the image with a given colored toner, and the developed image is transferred to a copy sheet before a subsequent reproduction of the document is performed. During the subsequent reproduction, the non-selected portions of the latent image remain on the photoconductive surface and the selected portions are erased prior to development with a different color than the given colored toner of the non-selected portions of the document and the transfer of the non-selected portions to the same copy sheet that previously received the selected portions.
    Type: Grant
    Filed: June 30, 1975
    Date of Patent: August 30, 1977
    Assignee: Xerox Corporation
    Inventor: James H. McVeigh
  • Patent number: 4040828
    Abstract: An imaging system is disclosed wherein unpigmented transparent xerographic toner images are used to make color and full color pictorial transparencies and selected hard copy according to specific toner-tacking methods.
    Type: Grant
    Filed: January 6, 1975
    Date of Patent: August 9, 1977
    Assignee: Xerox Corporation
    Inventor: Paul F. Evans
  • Patent number: 4038943
    Abstract: Method and apparatus for reducing X-ray dosage required for xeroradiographic examinations without reducing the relative information capacity of the images produced during the examination. In particular, a charged xerographic plate is positioned adjacent the object to be examined and penetrating X-ray radiation is projected through the object onto the plate surface, forming a latent electrostatic image on the surface of the plate. The penetrating radiation utilized is of a substantially lower dosage than normally utilized. The image is then partially developed with developing powder and the partially developed image is then charged and exposed to substantially uniform radiation. The exposed charged image is finally developed by applying additional developing powder thereto resulting in an enhanced image or signal.
    Type: Grant
    Filed: June 20, 1975
    Date of Patent: August 2, 1977
    Assignee: Xerox Corporation
    Inventors: Alan C. Nelson, Lothar S. Jeromin
  • Patent number: 4038076
    Abstract: Positive and negative copies are formed from both positive and negative originals by developing with both positively and negatively charged toner and selectively transferring toner of one polarity to produce a positive or negative print. The developer may be comprised of two toners and a single carrier; two carriers and a single toner or a single toner and a single carrier.
    Type: Grant
    Filed: March 25, 1975
    Date of Patent: July 26, 1977
    Assignee: Xerox Corporation
    Inventor: Anthony F. Lipani
  • Patent number: 4023968
    Abstract: In an electrophoretic reproduction process wherein a colored reproduction of an original is obtained by sequentially electrophoretically generating at least two visible monochromatic images, and superimposing said images in registry upon a copy web to form a colored reproduction, an improvement is provided comprising essentially eliminating back migration of marking materials from the copy web to the imaging suspension in the second and subsequent image generating steps by employing, in each instance, marking materials comprising a solvent tackifiable polymer and a colorant and/or a copy web containing a solvent tackifiable polymer, and applying to the copy web at least a partial solvent for said tackifiable polymer in an amount sufficient to render said polymer at least partially tacky before the second and before each subsequent image generating step.
    Type: Grant
    Filed: October 25, 1972
    Date of Patent: May 17, 1977
    Assignee: Xerox Corporation
    Inventors: Alan B. Amidon, Joseph Mammino
  • Patent number: 4017311
    Abstract: There are described novel yellow compounds which are represented by the formula ##STR1## wherein X is a member selected from the group consisting of ##STR2## The compounds may be used for various applications and preferably are utilized as imaging particles in the photoelectrophoretic imaging method.
    Type: Grant
    Filed: November 10, 1975
    Date of Patent: April 12, 1977
    Assignee: Xerox Corporation
    Inventor: Robert J. Gruber
  • Patent number: 4014856
    Abstract: A liquid toner composition comprising carrier liquid and toner particles for the development of electrostatic charge patterns is described wherein the said liquid comprises (1) a bivalent or trivalent metal salt of an oxyacid derived from phosphorus containing at least one organic residue and (2) one or more members selected from the group consisting of amines, polyurethans and alkylated polymers of a heterocyclic N-vinyl monomer. By means of the materials (1) and (2) the polarity of the toner particles can be controlled to obtain optimum image density and contrast. When carbon blacks are used as toner material it is possible to control the polarity to obtain either positive-working or negative-working toner compositions.
    Type: Grant
    Filed: July 5, 1973
    Date of Patent: March 29, 1977
    Assignee: AGFA-GEVAERT, N.V.
    Inventors: Yvan Karel Gilliams, Jozef Leonard Van Engeland, Noel Jozef De Volder
  • Patent number: 3996056
    Abstract: Plastic pigment spheric particles which form a matrix for diazotype reproduction materials are applied to a base sheet. Whether the diazo sensitizing solution is included in admixture with spheric plastic pigment particles or is applied thereafter as a second coating, a matrix is formed having a sensitized diazo layer dispersed throughout. Such diazo matrices permit control of contrast ratios over a wide range. Also such diazo matrices are transferable. The diazo matrix image can be made water fast by an after treatment by means of a solvent. Such a matrix lends itself to the heat development process by retaining the heat generated development agents within the matrix due to its thermoplastic character. In another aspect of the invention multi-color diazo reproduction on a single base sheet employing consecutive overcoatings of the matrix and diazo sensitizing solution after each development can be achieved.
    Type: Grant
    Filed: February 5, 1975
    Date of Patent: December 7, 1976
    Assignee: Andrews Paper & Chemical Co.
    Inventor: Peter Muller
  • Patent number: 3989366
    Abstract: A photoelectrophoretic imaging machine for producing, in a preferred embodiment, full color copies from opaque originals or, alternatively, copies from transparencies.In a preferred embodiment, the formation of photoelectrophoretic images occur between two thin injecting and blocking webs at least one of which is partially transparent and the image formed is transferred to a paper web. The injecting and blocking webs may be disposable, thus, cleaning systems are not required. The injecting web is provided with a conductive surface and is driven in a path to the inking station where a layer of photoelectrophoretic ink is applied to the conductive web surface. The inked injecting web is driven in a path passing the deposition scorotron at the precharge station and into contact with the blocking web to form the inkweb sandwich at the imaging roller in the imaging zone.
    Type: Grant
    Filed: April 24, 1975
    Date of Patent: November 2, 1976
    Assignee: Xerox Corporation
    Inventors: Roger G. Teumer, Peter J. Warter, Jr., Gino F. Squassoni, Vsevolod Tulagin, Raymond K. Egnaczak
  • Patent number: 3981727
    Abstract: Method and apparatus for reducing X-ray dosage required for xeroradiographic examinations without reducing the relative information capacity of the images produced during the examination. In particular, a charged xerographic plate is positioned adjacent the object to be examined and penetrating X-ray radiation is projected through the object onto the plate surface, forming a latent electrostatic image on the surface of the plate. The penetrating radiation utilized is of a substantially lower dosage than normally utilized. The image is then partially developed with developing powder and the partially developed image is then charged and exposed to substantially uniform radiation. The exposed charged image is finally developed by applying additional developing powder thereto resulting in an enhanced image or signal.
    Type: Grant
    Filed: June 5, 1974
    Date of Patent: September 21, 1976
    Assignee: Xerox Corporation
    Inventors: Alan C. Nelson, Lothar S. Jeromin
  • Patent number: 3980477
    Abstract: An improved photoelectrophoretic imaging method is disclosed wherein a blocking layer is provided with a coating which interacts, in the dark, with the pigment particles of the imaging suspension so as to provide a uniformly charged imaging suspension upon exposure of the suspension to an electric field. The coating material occupies at least a substantially equal position in the Dark Charge Injection Series as any pigment in the imaging suspension. Subsequent or simultaneous electromagnetic radiation to which at least some of the particles are sensitive then results in the formation of optically positive and negative images.
    Type: Grant
    Filed: November 26, 1974
    Date of Patent: September 14, 1976
    Assignee: Xerox Corporation
    Inventors: P. Keith Watson, Paul J. Cressman, Richard V. LaDonna
  • Patent number: 3976485
    Abstract: An electrophoretic migration imaging process, apparatus, and materials useful therein are disclosed. Electrically photosensitive particles, at least some of which bear a positive polarity electrostatic charge, are disposed between two spaced electrodes. One of the electrodes has the surface thereof adjacent to the electrically photosensitive particles bearing a uniform layer containing an amount of a dark charge exchange material sufficient to provide a net change in charge polarity with at least a portion of said positive polarity particles upon electrical contact therewith in the presence of an electric field and in the absence of activating radiation. Imaging is accomplished byA. disposing the electrically photosensitive particles between the spaced electrodes, andB. substantially simultaneously1.
    Type: Grant
    Filed: August 25, 1975
    Date of Patent: August 24, 1976
    Assignee: Eastman Kodak Company
    Inventor: Carl F. Groner
  • Patent number: 3966466
    Abstract: An improved photoelectrophoretic imaging method is disclosed wherein a blocking layer is provided with a coating which interacts, in the dark, with the pigment particles of the imaging suspension so as to provide a uniformly charged imaging suspension upon exposure of the suspension to an electric field. The coating comprises a compound selected from the group consisting of inorganic salts of lithium, iodine, tin and iron.
    Type: Grant
    Filed: December 17, 1974
    Date of Patent: June 29, 1976
    Assignee: Xerox Corporation
    Inventors: Geoffrey A. Page, Steven J. Grammatica, Joan R. Ewing
  • Patent number: 3960444
    Abstract: An electrophotographic printing machine and method of use therefor in which a plurality of light images of the same original document are formed. Each of the light images is of a different predetermined magnitude and irradiates a charged photoconductive member to record a plurality of electrostatic latent images thereof. The electrostatic latent images are developed with developer mixes having differing predetermined concentrations of toner particles therein. These developed powder images are transferred, in superimposed registration with one another, onto a common sheet of support material forming a high quality reproduction of the original document.
    Type: Grant
    Filed: August 14, 1974
    Date of Patent: June 1, 1976
    Assignee: Xerox Corporation
    Inventors: Robert W. Gundlach, Charles A. Whited, Thomas W. Pike
  • Patent number: 3957829
    Abstract: There are described novel yellow compounds which are represented by the formula ##SPC1##Wherein X is a member selected from the group consisting of ##SPC2##The compounds may be used for various applications and preferably are utilized as imaging particles in the photoelectrophoretic imaging method.
    Type: Grant
    Filed: July 29, 1974
    Date of Patent: May 18, 1976
    Assignee: Xerox Corporation
    Inventor: Robert J. Gruber
  • Patent number: 3953462
    Abstract: 3-Bromo-N-2"-pyridyl-8,13-dioxodinaphtho-(2,1-b;3',3'-d)-furan-6-carboxamid e is described as a new composition of matter along with its use in electrophotographic and photoelectrophoretic imaging processes.
    Type: Grant
    Filed: October 29, 1973
    Date of Patent: April 27, 1976
    Assignee: Xeerox Corporation
    Inventors: Robert J. Gruber, Nicholas J. Germano
  • Patent number: 3933423
    Abstract: Dry leather is dyed with azoic dyes without wetting the leather with water by incorporating into the leather the required diazonium component and any required coupling component in a substantially non-aqueous volatile low-viscosity solvent and incorporating into the leather any other materials required for the coupling reaction in such a solvent or as a vapor. The coupling component can be a natural or synthetic phenolic tanning agent employed in tanning the leather. Dye patterns can be applied to the surface of the leather by using a light-sensitive diazonium component and photo-imaging the surface before effecting coupling. Dry leather is dyed by such processes without significant change in properties.
    Type: Grant
    Filed: May 15, 1973
    Date of Patent: January 20, 1976
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Catharine Elizabeth Looney
  • Patent number: 3933664
    Abstract: A light-transparent photoconductive material for use in electrophotography is the reaction product obtained by condensingA. an organic photoconductive compound containing an amino and/or hydroxyl group andB. a reactive colored compound containing an active halogen atom;Or by condensingA. an organic photoconductive compound containing an active halogen atom andB. a reactive colored compound containing an amino and/or hydroxyl group.
    Type: Grant
    Filed: November 6, 1974
    Date of Patent: January 20, 1976
    Assignee: Canon Inc.
    Inventors: Shinichiro Nagashima, Kaichi Tsuchiya