Patents by Inventor Ram S. Narang

Ram S. Narang 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: 6022095
    Abstract: Disclosed is an improved composition comprising a photopatternable polymer containing at least some monomer repeat units with photosensitivity-imparting substituents, said photopatternable polymer being of the general formula ##STR1## wherein x is an integer of 0 or 1, A is one of several specified groups, such as ##STR2## B is one of several specified groups, such as ##STR3## or mixtures thereof, and n is an integer representing the number of repeating monomer units. Also disclosed is a process for preparing a thermal ink jet printhead with the aforementioned polymer and a thermal ink jet printhead containing therein a layer of a crosslinked or chain extended polymer of the above formula.
    Type: Grant
    Filed: December 23, 1998
    Date of Patent: February 8, 2000
    Assignee: Xerox Corporation
    Inventors: Ram S. Narang, Timothy J. Fuller, Thomas W. Smith, David J. Luca, Ralph A. Mosher
  • Patent number: 6007877
    Abstract: Disclosed is a composition which comprises a polymer containing at least some monomer repeat units with water-solubility- or water-dispersability-imparting substituents and at least some monomer repeat units with photosensitivity-imparting substituents which enable crosslinking or chain extension of the polymer upon exposure to actinic radiation, said polymer being of the formula ##STR1## wherein x is an integer of 0 or 1, A is one of several specified groups, such as ##STR2## B is one of several specified groups, such as ##STR3## or mixtures thereof, and n is an integer representing the number of repeating monomer units. In one embodiment, a single functional group imparts both photosensitivity and water solubility or dispersability to the polymer. In another embodiment, a first functional group imparts photosensitivity to the polymer and a second functional group imparts water solubility or dispersability to the polymer.
    Type: Grant
    Filed: August 29, 1996
    Date of Patent: December 28, 1999
    Assignee: Xerox Corporation
    Inventors: Ram S. Narang, Timothy J. Fuller
  • Patent number: 5994425
    Abstract: Disclosed is an improved composition comprising a photopatternable polymer containing at least some monomer repeat units with photosensitivity-imparting substituents, said photopatternable polymer being of the general formula ##STR1## wherein x is an integer of 0 or 1, A is one of several specified groups, such as ##STR2## B is one of several specified groups, such as ##STR3## or mixtures thereof, and n is an integer representing the number of repeating monomer units. Also disclosed is a process for preparing a thermal ink jet printhead with the aforementioned polymer and a thermal ink jet printhead containing therein a layer of a crosslinked or chain extended polymer of the above formula.
    Type: Grant
    Filed: August 29, 1996
    Date of Patent: November 30, 1999
    Assignee: Xerox Corporation
    Inventors: Ram S. Narang, Timothy J. Fuller, Thomas W. Smith, David J. Luca, Ralph A. Mosher
  • Patent number: 5976418
    Abstract: A conductive polymer composition selected from the group consisting ofa first composition includinga polymer containing halomethylated aromatic groups, anda charge transporting material selected from the group consisting ofat least one charge transport monomer containing arylamine groups,at least one charge transport polymer containing arylamine units in the main polymer chain,and mixtures thereof, anda second composition includingat least one monomer containing a halomethylated aromatic group,at least one charge transport monomer containing arylamine groups anda polymer binder, anda third composition including:at least one monomer containing a halomethylated aromatic group, andat least one charge transport polymer with arylamine units in the main polymer chain.The aforementioned compositions may be applied as coatings and used in high speed laser printing and related printing processes.
    Type: Grant
    Filed: November 5, 1998
    Date of Patent: November 2, 1999
    Assignee: Xerox Corporation
    Inventors: Timothy J. Fuller, Damodar M. Pai, John F. Yanus, Paul J. DeFeo, Markus R. Silvestri, Ram S. Narang, William W. Limburg, Dale S. Renfer, Milan Stolka, Martin A. Abkowitz, Ralph A. Mosher
  • Patent number: 5958995
    Abstract: Disclosed is a composition for preparing a thermal ink jet printhead which comprises a mixture of (A) a polymer, some monomer repeat units of which have at least one photosensitivity-imparting group thereon, said polymer having a first degree of photosensitivity-imparting group substitution measured in milliequivalents photosensitivity-imparting group per gram either (1) a polymer having a second degree of photosensitivity-imparting group substitution measured in milliequivalents of photosensitivity-imparting group per gram lower than the first degree of photosensitivity-imparting group substitution, wherein said second degree of photosensitivity-imparting group substitution may be zero, wherein the mixture of the first component and the second component has a third degree of photosensitivity-imparting group substitution measured in milliequivalents of photosensitivity-imparting group per gram which is lower than the first degree of photosensitivity-imparting group substitution and higher than the second degr
    Type: Grant
    Filed: August 29, 1996
    Date of Patent: September 28, 1999
    Assignee: Xerox Corporation
    Inventors: Ram S. Narang, Timothy J. Fuller
  • Patent number: 5945253
    Abstract: Disclosed is a composition which comprises a polymer containing at least some monomer repeat units with photosensitivity-imparting substituents which enable crosslinking or chain extension of the polymer upon exposure to actinic radiation, said polymer being of the formula ##STR1## wherein x is an integer of 0 or 1, A is one of several specified groups, such as ##STR2## B is one of several specified groups, such as ##STR3## or mixtures thereof, and n is an integer representing the number of repeating monomer units, wherein said photosensitivity-imparting substituents are allyl ether groups, epoxy groups, or mixtures thereof. Also disclosed are a process for preparing a thermal ink jet printhead containing the aforementioned polymers and processes for preparing the aforementioned polymers.
    Type: Grant
    Filed: August 29, 1996
    Date of Patent: August 31, 1999
    Assignee: Xerox Corporation
    Inventors: Ram S. Narang, Timothy J. Fuller
  • Patent number: 5939206
    Abstract: Disclosed is an apparatus which comprises at least one semiconductor chip mounted on a substrate, said substrate comprising a porous, electrically conductive member having electrophoretically deposited thereon a coating of a polymeric material. In one embodiment, the semiconductor chips are thermal ink jet printhead subunits.
    Type: Grant
    Filed: August 29, 1996
    Date of Patent: August 17, 1999
    Assignee: Xerox Corporation
    Inventors: Gary A. Kneezel, Ram S. Narang, Timothy J. Fuller, Peter J. John
  • Patent number: 5907001
    Abstract: A process comprising:reacting a first polymer containing at least one haloalkyl substituted styrene, with a reactive acrylate compound wherein the haloalkyl substituent is converted to an alkylacrylate ester or an alkylacrylate ester ammonium salt to form an acrylated second polymer, andirradiating said acrylated second polymer.
    Type: Grant
    Filed: September 24, 1997
    Date of Patent: May 25, 1999
    Assignee: Xerox Corporation
    Inventors: Daniel A. Foucher, Katsumi Daimon, Peter M. Kazmaier, Timothy J. Fuller, Ram S. Narang
  • Patent number: 5898449
    Abstract: An ink cartridge for an ink jet printer has an ink supply in a housing, a printhead fixedly attached thereto, and an interface seal between the housing and printhead. The ink is contained in an absorbent material in the housing which is partitioned from the printhead assembly by a housing wall having a vent and an ink outlet. The ink flow path from the housing outlet to the printhead inlet is produced by a recess in the outer surface of the housing wall covered by the interface seal. The seal is a porous member having a thermosetting adhesive layer on one side thereof. The porous member has a slot therethrough, and the adhesive is the type not attacked by the ink. The surface of the porous member with the adhesive is bonded to the housing wall. The thermosetting adhesive moves through the porous member and bonds to the printhead surface containing the ink inlet to the housing wall, when the adhesive is cured.
    Type: Grant
    Filed: December 20, 1993
    Date of Patent: April 27, 1999
    Assignee: Xerox Corporation
    Inventors: Ram S. Narang, William R. Burger
  • Patent number: 5889077
    Abstract: Disclosed is a process which comprises reacting a polymer of the general formula ##STR1## wherein x is an integer of 0 or 1, A is one of several specified groups, such as ##STR2## B is one of several specified groups, such as ##STR3## or mixtures thereof, and n is an integer representing the number of repeating monomer units, with (i) a formaldehyde source, and (ii) an unsaturated acid in the presence of an acid catalyst, thereby forming a curable polymer with unsaturated ester groups. Also disclosed is a process for preparing an ink jet printhead with the above polymer.
    Type: Grant
    Filed: August 29, 1996
    Date of Patent: March 30, 1999
    Assignee: Xerox Corporation
    Inventors: Timothy J. Fuller, Ram S. Narang, Thomas W. Smith, David J. Luca, Raymond K. Crandall
  • Patent number: 5869595
    Abstract: Disclosed is a process which comprises reacting a polyimide precursor with borane. Also disclosed is a thermal ink jet printhead containing a layer comprising the product of this reaction.
    Type: Grant
    Filed: April 10, 1998
    Date of Patent: February 9, 1999
    Assignee: Xerox Corporation
    Inventors: Timothy J. Fuller, Ram S. Narang
  • Patent number: 5863963
    Abstract: Disclosed is a process which comprises the steps of (a) providing a polymer containing at least some monomer repeat units with halomethyl group substituents which enable crosslinking or chain extension of the polymer upon exposure to a radiation source which is electron beam radiation, x-ray radiation, or deep ultraviolet radiation, said polymer being of the formula ##STR1## wherein x is an integer of 0 or 1, A is one of several groups as specified in the claims, B is one of several groups as specified in the claims, and n is an integer representing the number of repeating monomer units, and (b) causing the polymer to become crosslinked or chain extended through the photosensitivity-imparting groups. Also disclosed is a process for preparing a thermal ink jet printhead by the aforementioned curing process.
    Type: Grant
    Filed: August 29, 1996
    Date of Patent: January 26, 1999
    Assignee: Xerox Corporation
    Inventors: Ram S. Narang, Timothy J. Fuller
  • Patent number: 5849809
    Abstract: Disclosed is a composition which comprises (a) a polymer containing at least some monomer repeat units with photosensitivity-imparting substituents which enable crosslinking or chain extension of the polymer upon exposure to actinic radiation, said polymer being of the formula ##STR1## wherein x is an integer of 0 or 1, A is one of several specified groups, such as ##STR2## B is one of several specified groups, such as ##STR3## or mixtures thereof, and n is an integer representing the number of repeating monomer units, wherein said photosensitivity-imparting substituents are hydroxyalkyl groups; (b) at least one member selected from the group consisting of photoinitiators and sensitizers; and (c) an optional solvent. Also disclosed are processes for preparing the above polymers and methods of preparing thermal ink jet printheads containing the above polymers.
    Type: Grant
    Filed: August 29, 1996
    Date of Patent: December 15, 1998
    Assignee: Xerox Corporation
    Inventors: Ram S. Narang, Timothy J. Fuller
  • Patent number: 5843259
    Abstract: A method is described for uniformly coating portions of the surface of a substrate which is to be bonded to another substrate. In a described embodiment, the two substrates are channel plates and heater plates which, when bonded together, form a thermal ink jet printhead. The adhesive layer is electrophoretically deposited over a conductive pattern which has been formed on the binding substrate surface. The conductive pattern forms an electrode and is placed in an electrophoretic bath comprising a colloidal emulsion of a preselected polymer adhesive. The other electrode is a metal container in which the solution is placed or a conductive mesh placed within the container. The electrodes are connected across a voltage source and a field is applied. The substrate is placed in contact with the solution, and a small current flow is carefully controlled to create an extremely uniform thin deposition of charged adhesive micelles on the surface of the conductive pattern.
    Type: Grant
    Filed: August 29, 1996
    Date of Patent: December 1, 1998
    Assignee: Xerox Corporation
    Inventors: Ram S. Narang, Stephen F. Pond, Timothy J. Fuller
  • Patent number: 5773553
    Abstract: Disclosed is a process which comprises reacting a polyimide precursor with borane. Also disclosed is a thermal ink jet printhead containing a layer comprising the product of this reaction.
    Type: Grant
    Filed: June 13, 1996
    Date of Patent: June 30, 1998
    Assignee: Xerox Corporation
    Inventors: Timothy J. Fuller, Ram S. Narang
  • Patent number: 5762812
    Abstract: Disclosed is a thermal ink jet printhead which comprises (a) an upper substrate with a set of parallel grooves for subsequent use as ink channels and a recess for subsequent use as a manifold, the grooves being open at one end for serving as droplet emitting nozzles; and (b) a lower substrate in which one surface thereof has an array of heating elements and addressing electrodes formed thereon, the lower substrate having a thick film insulative layer deposited over the heating elements and addressing electrodes and patterned to form recesses therethrough to expose the heating elements and terminal ends of the addressing electrodes; said upper and lower substrates being aligned, mated, and bonded together to form the printhead with the grooves in the upper substrate being aligned with the heating elements in the lower substrate to form droplet emitting nozzles, wherein the upper and lower substrates are bonded together with an adhesive which comprises a reaction product of (a) an epoxy resin selected from the
    Type: Grant
    Filed: May 2, 1996
    Date of Patent: June 9, 1998
    Assignee: Xerox Corporation
    Inventor: Ram S. Narang
  • Patent number: 5761809
    Abstract: Disclosed is a process which comprises reacting a haloalkylated aromatic polymer with a material selected from the group consisting of unsaturated ester salts, alkoxide salts, alkylcarboxylate salts, and mixtures thereof, thereby forming a curable polymer having functional groups corresponding to the selected salt. Another embodiment of the present invention is directed to a process for preparing an ink jet printhead with the curable polymer thus prepared.
    Type: Grant
    Filed: August 29, 1996
    Date of Patent: June 9, 1998
    Assignee: Xerox Corporation
    Inventors: Timothy J. Fuller, Ram S. Narang, Thomas W. Smith, David J. Luca, Raymond K. Crandall
  • Patent number: 5753783
    Abstract: Disclosed is a process which comprises reacting a polymer of the general formula ##STR1## wherein x is an integer of 0 or 1, A is one of several specified groups, such as ##STR2## B is one of several specified groups, such as ##STR3## or mixtures thereof, and n is an integer representing the number of repeating monomer units, with an acetyl halide and dimethoxymethane in the presence of a halogen-containing Lewis acid catalyst and methanol, thereby forming a haloalkylated polymer. In a specific embodiment, the haloalkylated polymer is then reacted further to replace at least some of the haloalkyl groups with photosensitivity-imparting groups. Also disclosed is a process for preparing a thermal ink jet printhead with the aforementioned polymer.
    Type: Grant
    Filed: August 28, 1997
    Date of Patent: May 19, 1998
    Assignee: Xerox Corporation
    Inventors: Timothy J. Fuller, Ram S. Narang, Thomas W. Smith, David J. Luca, Raymond K. Crandall
  • Patent number: 5739254
    Abstract: Disclosed is a process which comprises reacting a polymer of the general formula ##STR1## wherein x is an integer of 0 or 1, A is one of several specified groups, such as ##STR2## B is one of several specified groups, such as ##STR3## or mixtures thereof, and n is an integer representing the number of repeating monomer units, with an acetyl halide and dimethoxymethane in the presence of a halogen-containing Lewis acid catalyst and methanol, thereby forming a haloalkylated polymer. In a specific embodiment, the haloalkylated polymer is then reacted further to replace at least some of the haloalkyl groups with photosensitivity-imparting groups. Also disclosed is a process for preparing a thermal ink jet printhead with the aforementioned polymer.
    Type: Grant
    Filed: August 29, 1996
    Date of Patent: April 14, 1998
    Assignee: Xerox Corporation
    Inventors: Timothy J. Fuller, Ram S. Narang, Thomas W. Smith, David J. Luca, Raymond K. Grandall
  • Patent number: 5696546
    Abstract: An ink cartridge for an ink jet printer has an ink supply in a housing and a printhead assembly fixedly attached thereto. The ink is contained in an absorbent material in the housing which is partitioned from the printhead assembly by a housing floor having a vent and an ink outlet. The ink flow path from the housing outlet to the printhead inlet is produced by an elongated recess in the outer surface of the housing floor and a film member bonded thereover by an adhesive not attacked or eroded by the ink. The film member has a slot therethrough to provide communication with the inlet of the printhead. The surface of the film member opposite the surface bonded to the housing floor is coated with a thermosetting adhesive which bonds to the printhead assembly surface containing the ink inlet.
    Type: Grant
    Filed: April 17, 1995
    Date of Patent: December 9, 1997
    Assignee: Xerox Corporation
    Inventors: Ram S. Narang, Stephen F. Pond