Patents by Inventor Richard A. Burt

Richard A. Burt has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6492080
    Abstract: A process including: forming a first chlorogallium phthalocyanine (ClGaPc) in N-methyl-2-pyrrolidone (NMP) to form a ClGaPc (NMP) Type-I product; forming a second chlorogallium phthalocyanine in dimethyl sulfoxide (DMSO) to form a ClGaPc (DMSO) Type-I product; separately dry milling and then wet treating the Type-I products to form respective Type-II products; blending the Type-II products together along with a resin to form a coating mixture; and coating the mixture to form a charge generator layer in an electrostatographic imaging article.
    Type: Grant
    Filed: March 23, 2001
    Date of Patent: December 10, 2002
    Assignee: Xerox Corporation
    Inventors: Richard A. Burt, George Liebermann, Cheng-Kuo Hsiao, Ah-Mee Hor
  • Publication number: 20020153897
    Abstract: An apparatus for obtaining resistivity images of a borehole includes an array of measure electrodes separated from a pad or the body of the instrument by a focusing electrode. The focusing electrode is maintained at a slightly higher potential than the measure electrodes. The apparatus is primarily intended for use with conducting fluids but may also be used with non-conducting fluids. A modulated electrical current with a carrier frequency of 1 MHz is injected into the formation. When used with a non-conducting fluid, capacitive coupling between the electrode and the conductive formation is provided by the dielectric of fluid. When used with a conducting borehole fluid, an additional capacitor may be incorporated into the circuit. The current in the measure electrode is indicative of the conductivity of the formation.
    Type: Application
    Filed: April 18, 2001
    Publication date: October 24, 2002
    Inventors: Martin Townley Evans, Andrew Richard Burt, Albert Alexy
  • Patent number: 6348796
    Abstract: An apparatus for obtaining resistivity images of a borehole includes an array of measure electrodes separated from a pad or the body of the instrument by a guard electrode. The guard electrode is maintained at a slightly lower potential than the pad and the measure electrode is at an intermediate potential thereto. With this arrangement, the current from the guard electrode defocuses the measure current from the measure electrode as it enters the formation, and at greater distances, the current from the measure electrode is refocused by the effect of the current from the pad. This defocusing and refocusing defines a region of investigation away from the borehole wall that is relatively insensitive to borehole rugosity. Circumferential and vertical overlap may be obtained either by the arrangement of the measure electrodes, or by relying on the broadening of the measure beam as it enters the formation.
    Type: Grant
    Filed: January 4, 2001
    Date of Patent: February 19, 2002
    Assignee: Baker Hughes Incorporated
    Inventors: Martin Townley Evans, Andrew Richard Burt
  • Publication number: 20010048638
    Abstract: An apparatus for obtaining resistivity images of a borehole includes an array of measure electrodes separated from a pad or the body of the instrument by a guard electrode. The guard electrode is maintained at a slightly lower potential than the pad and the measure electrode is at an intermediate potential thereto. With this arrangement, the current from the guard electrode defocuses the measure current from the measure electrode as it enters the formation, and at greater distances, the current from the measure electrode is refocused by the effect of the current from the pad. This defocusing and refocusing defines a region of investigation away from the borehole wall that is relatively insensitive to borehole rugosity. Circumferential and vertical overlap may be obtained either by the arrangement of the measure electrodes, or by relying on the broadening of the measure beam as it enters the formation.
    Type: Application
    Filed: January 4, 2001
    Publication date: December 6, 2001
    Inventors: Martin Townley Evans, Andrew Richard Burt
  • Patent number: 5521306
    Abstract: A process for the preparation of Type V hydroxygallium phthalocyanine which comprises the in situ formation of an alkoxy-bridged gallium phthalocyanine dimer, hydrolyzing said alkoxy-bridged gallium phthalocyanine dimer to hydroxygallium phthalocyanine, and subsequently converting the hydroxygallium phthalocyanine product obtained to Type V hydroxygallium phthalocyanine.
    Type: Grant
    Filed: April 26, 1994
    Date of Patent: May 28, 1996
    Assignee: Xerox Corporation
    Inventors: Richard A. Burt, Cheng-Kuo Hsiao, Dasarao Murti, Roger E. Gaynor, Barkev Keoshkerian, James D. Mayo, George Liebermann
  • Patent number: 5493016
    Abstract: A process for the preparation of alkoxy-bridged metallophthalocyanine dimers by the reaction of a trivalent metal compound with ortho-phthalodinitrile or 1,3-diiminoisoindoline in the presence of a diol.
    Type: Grant
    Filed: April 26, 1994
    Date of Patent: February 20, 1996
    Assignee: Xerox Corporation
    Inventors: Richard A. Burt, George Liebermann, Gordon K. Hamer, Sandra J. Gardner, Carol A. Jennings, Katsumi Daimon, Katsumi Nukada
  • Patent number: 5466796
    Abstract: Alkoxy-bridged metallophthalocyanine dimers of the formula C.sub.32 H.sub.16 N.sub.8 MOROMN.sub.8 H.sub.16 C.sub.32, or of the formula ##STR1## wherein M is a metal, and R is an alkyl or an alkyl ether.
    Type: Grant
    Filed: April 26, 1994
    Date of Patent: November 14, 1995
    Assignee: Xerox Corporation
    Inventors: Richard A. Burt, George Liebermann, Gordon K. Hamer, Sandra J. Gardner, Carol A. Jennings, Katsumi Daimon, Katsumi Nukada
  • Patent number: 5456998
    Abstract: Photoconductive imaging members comprised of an alkoxy-bridged metallophthalocyanine dimer as a charge generator material, wherein said dimer is of the formula C.sub.32 H.sub.16 N.sub.8 MOROMN.sub.8 H.sub.16 C.sub.
    Type: Grant
    Filed: April 26, 1994
    Date of Patent: October 10, 1995
    Assignee: Xerox Corporation
    Inventors: Richard A. Burt, Barkev Keoshkerian, George Liebermann, Cheng-Kuo Hsiao, Sandra J. Gardner, Dasarao K. Murti, Katsumi Daimon, Yasuo Sakaguchi, Ryosaku Igarashi
  • Patent number: 4808506
    Abstract: Disclosed is an improved layered photoresponsive imaging member comprised of a supporting substrate; an imidazole perinone comprised of components with a mixture of cis and trans isomers of Formulas III, IV, and V, including trans indanthrene Brilliant Orange, cis indanthrene Bordeaux Red; bis(4,5-dimethyl)benzimidazole perinone and bis 2,3 naphthimidazole perinone, and an aryl amine hole transport layer comprised of molecules of the following formula: ##STR1## dispersed in a resinous binder and wherein X is selected from the group consisting of halogen and alkyl.
    Type: Grant
    Filed: August 17, 1987
    Date of Patent: February 28, 1989
    Assignee: Xerox Corporation
    Inventors: Rafik O. Loutfy, Peter M. Kazmaier, Ah-Mee Hor, Richard A. Burt
  • Patent number: 4792508
    Abstract: An improved layered photoresponsive imaging member comprised of a supporting substrate; a photogenerator layer comprised of cis and trans naphthalene imidazole perylene component of the following formula; ##STR1## and an aryl amine hole transport layer dispersed in a resinous binder.
    Type: Grant
    Filed: June 29, 1987
    Date of Patent: December 20, 1988
    Assignee: Xerox Corporation
    Inventors: Peter M. Kazmaier, Richard A. Burt, Ah-Mee Hor, Cheng-Kuo Hsiao
  • Patent number: 4751327
    Abstract: Disclosed are unsymmetrical squaraine compounds of the following formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are independently selected from the group consisting of alkyl, aryl, heterocyclic, benzyl, and halobenzyl; and X.sub.1, X.sub.2 and X.sub.3 are independently selected from the group consisting of hydrogen, alkyl, halogen, carboxy, and hydroxy; and photoresponsive imaging members having incorporated therein the aforementioned squaraine compounds.
    Type: Grant
    Filed: October 2, 1986
    Date of Patent: June 14, 1988
    Assignee: Xerox Corporation
    Inventors: Peter M. Kazmaier, Richard A. Burt, Giuseppa Baranyi
  • Patent number: 4624904
    Abstract: Disclosed are unsymmetrical squaraine compounds of the following formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are independently selected from the group consisting of alkyl, aryl heterocyclic, benzyl, and halobenzyl; and X.sub.1, X.sub.2 and X.sub.3 are independently selected from the group consisting of hydrogen, alkyl, halogen, carboxy, and hydroxy; and photoresponsive imaging members having incorporated therein the aforementioned squaraine compounds.
    Type: Grant
    Filed: June 28, 1985
    Date of Patent: November 25, 1986
    Assignee: Xerox Corporation
    Inventors: Peter M. Kazmaier, Richard A. Burt, Giuseppa Baranyi
  • Patent number: 4607124
    Abstract: An improved process for the preparation of mixed squaraine compositions which comprises reacting squaric acid, an aromatic amine, and a fluoroaniline, in the presence of an aliphatic alcohol, and an optional azeotropic substance.
    Type: Grant
    Filed: October 30, 1985
    Date of Patent: August 19, 1986
    Assignee: Xerox Corporation
    Inventors: Peter M. Kazmaier, Giuseppa Baranyi, Cheng-Kuo Hsiao, Richard A. Burt
  • Patent number: 4559286
    Abstract: An improved process for the preparation of mixed squaraine compositions which comprises reacting squaric acid, an aromatic amine, and a fluoroaniline, in the presence of an aliphatic alcohol, and an optional azeotropic substance.
    Type: Grant
    Filed: September 13, 1984
    Date of Patent: December 17, 1985
    Assignee: Xerox Corporation
    Inventors: Peter M. Kazmaier, Giuseppa Baranyi, Cheng-Kuo Hsiao, Richard A. Burt
  • Patent number: 4552822
    Abstract: Photoresponsive devices, including layered photoresponsive devices comprised of a photoconductive layer of squaraine compositions of the following formula: ##STR1## wherein R.sub.1, R.sub.2, and R.sub.3 are independently selected from the group consisting of alkyl substitutents and aryl substituents.
    Type: Grant
    Filed: December 5, 1983
    Date of Patent: November 12, 1985
    Assignee: Xerox Corporation
    Inventors: Peter M. Kazmaier, Guiseppa Baranyi, Cheng-kuo Hsiao, Richard A. Burt
  • Patent number: 4524218
    Abstract: Disclosed is an improved process for the preparation of squaraine compositions which comprises reacting squaric acid, an aromatic amine, and a composition selected from the group consisting of phenols and phenol squaraines, in the presence of an aliphatic alcohol, and an optional azeotropic substance.
    Type: Grant
    Filed: January 11, 1984
    Date of Patent: June 18, 1985
    Assignee: Xerox Corporation
    Inventors: Giuseppa Baranyi, Peter M. Kazmaier, Cheng-Kuo Hsiao, Richard A. Burt
  • Patent number: 4507480
    Abstract: Squaraine compositions of the following formula ##STR1## wherein Ar is selected from the moieties specified in the specification are useful for incorporation into layered photoresponsive devices.
    Type: Grant
    Filed: May 9, 1983
    Date of Patent: March 26, 1985
    Assignee: Xerox Corporation
    Inventors: Anthony M. Horgan, Peter M. Kazmaier, Richard A. Burt
  • Patent number: 4471041
    Abstract: An improved photoresponsive device comprised in the order stated of (1) a supporting substrate, (2) a photoconductive layer comprised of squaraine compositions of the following formula: ##STR1## wherein Ar is selected from the moieties specified resulting in the following -squaraines:I. bis-9-(8-hydroxyjulolidinyl)squaraine ##STR2## II. bis-9-(8,10-dihydroxyjulolidinyl)squaraine ##STR3## III. bis(4-dimethylamino-2-methylthiophenyl)squaraine ##STR4## and IV. bis(2,6-dihydroxy-4-dimethylaminophenyl)squaraine ##STR5## and (3) a diamine hole transport layer.
    Type: Grant
    Filed: May 9, 1983
    Date of Patent: September 11, 1984
    Assignee: Xerox Corporation
    Inventors: Giuseppa Baranyi, Richard A. Burt, Cheng-Kuo Hsiao, Peter M. Kazmaier, Kathleen M. Carmichael, Anthony M. Horgan