Patents by Inventor Mohamed A. Elmasry

Mohamed A. Elmasry 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: 7935656
    Abstract: The present teachings provide thermosensitive recording compositions which are useful for preparing thermosensitive recording media for displaying images. The thermosensitive recording media can include a substrate, a thermosensitive recording composition, and a topcoat. Methods of preparing and using the thermosensitive recording media also are disclosed.
    Type: Grant
    Filed: July 12, 2007
    Date of Patent: May 3, 2011
    Assignee: Nashua Corporation
    Inventors: Mohamed A. Elmasry, William M. Sawyer
  • Publication number: 20080015107
    Abstract: The present teachings provide thermosensitive recording compositions which are useful for preparing thermosensitive recording media for displaying images. The thermosensitive recording media can include a substrate, a thermosensitive recording composition, and a topcoat. Methods of preparing and using the thermosensitive recording media also are disclosed.
    Type: Application
    Filed: July 12, 2007
    Publication date: January 17, 2008
    Inventors: Mohamed Elmasry, William Sawyer
  • Patent number: 6348432
    Abstract: Disclosed are heat sensitive coatings and record materials that are environmentally resistant and therefore do not require a protective coating. One embodiment includes an environmentally resistant heat sensitive coating that includes an acrylate polymer of the formula: wherein R1 is a hydrogen or a methyl group, R2 is a hydrogen or a methyl group, and R3 is nitrile or chlorine or wherein, when c is 0, R4 is methyl, phenyl, or substituted phenyl, and when c is greater than 0, R4 is methyl, phenyl, substituted phenyl, halogen, nitrile or hydroxyl; m is greater than 1; n is greater than 1; b is greater than or equal to 0; and c is an integer from 0 to 38.
    Type: Grant
    Filed: March 10, 2000
    Date of Patent: February 19, 2002
    Assignee: Nashua Corporation
    Inventor: Mohamed Elmasry
  • Patent number: 6028454
    Abstract: A dynamic current mode circuit for low-voltage and high performance VLSI applications, comprising a MOS current mode logic block and dynamic circuitry for precharging the outputs of the MOS current mode logic block, cross-coupled latches for enhancing performance of the MOS current mode logic block during an evaluation phase thereof, and a dynamic current source for enhanced speed and low power consumption.
    Type: Grant
    Filed: June 12, 1998
    Date of Patent: February 22, 2000
    Assignee: The University of Waterloo
    Inventors: Mohamed Elmasry, Mohamed Allam
  • Patent number: 5525916
    Abstract: An All-N-Logic (ANL) high-speed single-phase dynamic CMOS logic utilizing all-N-logic blocks. According to a first embodiment, a 2:1 frequency divider is provided using the ANL CMOS logic of the present invention. According to a second embodiment, a pipelines 8-bit carry generator is provided utilizing five stacked NMOS gates.
    Type: Grant
    Filed: April 10, 1995
    Date of Patent: June 11, 1996
    Assignee: The University of Waterloo
    Inventors: Richard Gu, Mohamed Elmasry
  • Patent number: 5302482
    Abstract: A liquid electrophotographic toner having a coordinated association of steric stabilizer and charge directing moiety displays improved characteristics when the charge directing moiety has a monovalent alkali metal or ammonium cation bonded thereto.
    Type: Grant
    Filed: February 8, 1991
    Date of Patent: April 12, 1994
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Mohamed A. Elmasry, Kevin M. Kidnie, Susan K. Jongewaard, Gregory L. Zwadlo
  • Patent number: 5075352
    Abstract: Stable latices of polymer particles insoluble in non-polar organic solvents are prepared by the attachment of the insoluble polymer particles to a stabilizer soluble in the non-polar organic solvent. The stabilizer comprises the adduct of a polymer bearing pendant azlactone groups which is soluble in non-polar organic solvents and an ethylenically unsaturated nucleophile bearing an azlactone reactive nucleophilic moiety.
    Type: Grant
    Filed: August 30, 1990
    Date of Patent: December 24, 1991
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Mohamed A. Elmasry
  • Patent number: 5066559
    Abstract: Liquid toners for developing electrophotographic images contain dispersed toner particles which are based on a polymer with multiple 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 organic acid containing moieties having pKa's less than 4.5 which in turn are chemically bonded to metal soap containing compounds derived from organic acids having a pKa greater than 4.5. The toner particles so formed have advantageous properties of high charge/mass, and good charge and dispersion stability.
    Type: Grant
    Filed: January 22, 1990
    Date of Patent: November 19, 1991
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Mohamed A. Elmasry, Kevin M. Kidnie
  • Patent number: 5061583
    Abstract: There is disclosed here a class of liquid toner dispersions for developing electrophotographic images which give very high contrast half-tone dots with low contrast scanning light beams such as gaussian laser beams. The advantage of these toners is enhanced by the use of high electric field electrophoretic development conditions with high replenishment rate under which conditions rapid development to high image densities is obtained. This class of toners has toner particles of high mobility, low particle concentration in the dispersion, and a low fraction of its conductivity in the liquid milieu.
    Type: Grant
    Filed: January 19, 1990
    Date of Patent: October 29, 1991
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Gregory L. Zwadlo, Kevin M. Kidnie, Mohamed A. Elmasry
  • Patent number: 4988602
    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 Tg 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 and a thermoplastic ester resin that functions as a charge enhancing component for the toner. The toner particles so formed have advantageous properties of high charge/mass, and good charge and dispersion stability.
    Type: Grant
    Filed: April 18, 1990
    Date of Patent: January 29, 1991
    Assignee: Minnesota Mining and Manufacturing Co.
    Inventors: Susan K. Jongewaard, Mohamed A. Elmasry, Kevin M. Kidnie
  • 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: 4946753
    Abstract: Liquid toners are generally recognized as being capable of providing sharper electrophotographic images, but have been found to provide less than desirable results in multicolor imaging processes. The selection of a unique combination of (a) the ratio of conductivities between the toner liquid and the total toner composition, and (b) the zeta potential of the toner particles in the carrier liquid have been found to provide unique benefits to the quality of the liquid tone multicolor images.
    Type: Grant
    Filed: December 2, 1988
    Date of Patent: August 7, 1990
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Mohamed A. Elmasry, Gregory L. Zwadlo, Kevin M. Kednee
  • Patent number: 4925766
    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: December 2, 1988
    Date of Patent: May 15, 1990
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Mohamed A. Elmasry, Kevin M. Kidnie
  • Patent number: 4822643
    Abstract: A thermal imaging transfer process and donor sheet are described. The donor sheet comprises a layer of particulate colorant/binder on a substrate. Essentially individual particles are transferred during imaging to provide a high resolution image.
    Type: Grant
    Filed: June 30, 1987
    Date of Patent: April 18, 1989
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Hsin-Hsin Chou, Mohamed A. Elmasry, Jeffrey C. Chang, Kevin M. Kidnie
  • Patent number: 4739029
    Abstract: A polymeric tricarbocyanine dye has a rigidized chain having tricarbocyanine polymeric dye units of formula II: ##STR1## wherein Y is ##STR2## --S--, --Se--, or --O--, A is ##STR3## in which R.sup.19 is alkyl, --Cl, amino, alkyl (C.sub.1 to C.sub.4) substituted amino, phenyl, or cyclic amino, andp is 0 or 1,R.sup.4 and R.sup.5 independently are --H, C.sub.6 H.sub.5 SO.sub.2 --, or CF.sub.3 SO.sub.2 --,W is a dye anion,m is an integer 1 to 20, andn is an integer 2 to 10,000.
    Type: Grant
    Filed: April 16, 1987
    Date of Patent: April 19, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Mohamed A. Elmasry
  • Patent number: 4680375
    Abstract: Tricarbocyanine polymeric dyes have formulae I and II: ##STR1## where Y can be ##STR2## --S--, --Se-- or --O--, A can be ##STR3## in which R.sup.19 can be alkyl or --Cl, and p can be 0 or 1, R.sup.6 and R.sup.7 independently can be alkyl of (C.sub.1 -C.sub.30), preferably (C.sub.1 -C.sub.18),R.sup.4 and R.sup.5 independently can be --H, C.sub.6 H.sub.5 SO.sub.2 --, or CF.sub.3 SO.sub.2 --,Z can be --SO.sub.2 --, --CH.sub.2).sub.m, or vinylene,W can be I.sup.-, Br.sup.-, Cl.sup.-, ClO.sub.4.sup.-, PECHS.sup.- (polyethylcyclohexylsulfonate), F.sub.3 CSO.sub.3.sup.- (trifluoromethanesulfonate), or other commonly used dye anions,m is an integer of 1 to 20, andn is an integer of 5 to 10,000.
    Type: Grant
    Filed: March 11, 1985
    Date of Patent: July 14, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Mohamed A. Elmasry
  • Patent number: 4666819
    Abstract: An optical recording medium of thermoplastic, radiation-absorbing material comprises at least one polymeric dye which is capable of selective radiation absorption in the wavelength range 300-1000 nm so as to allow thermoplastic deformation of the material by a focused beam of radiation.
    Type: Grant
    Filed: March 11, 1985
    Date of Patent: May 19, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Mohamed A. Elmasry
  • Patent number: 4619990
    Abstract: Polymeric dyes having pendent chromophore groups which are selected from azo, tricyanovinyl, anthraquinone, methine, and indoaniline groups fall into two classes, [A] condensation polymers, and [B] polymers derived from copolymerized ethylenically-unsaturated monomers, the dyes being capable of undergoing thermoplastic deformation by a focused laser beam when in a layer of thickness in the range of 0.1 to 100 micrometers and having an absorptivity in the range of 10 to 250 Lg.sup.-1 cm.sup.-1. They are film-forming, thermally- and light-stable, and solvent-coatable. These compounds are useful as coloring and light-absorbing agents, particularly as the light-absorbing agents in thin optical recording layers.
    Type: Grant
    Filed: March 11, 1985
    Date of Patent: October 28, 1986
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Mohamed A. Elmasry