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).
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Patent number: 7935656Abstract: 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: GrantFiled: July 12, 2007Date of Patent: May 3, 2011Assignee: Nashua CorporationInventors: Mohamed A. Elmasry, William M. Sawyer
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Publication number: 20080015107Abstract: 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: ApplicationFiled: July 12, 2007Publication date: January 17, 2008Inventors: Mohamed Elmasry, William Sawyer
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Patent number: 6348432Abstract: 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: GrantFiled: March 10, 2000Date of Patent: February 19, 2002Assignee: Nashua CorporationInventor: Mohamed Elmasry
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Patent number: 6028454Abstract: 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: GrantFiled: June 12, 1998Date of Patent: February 22, 2000Assignee: The University of WaterlooInventors: Mohamed Elmasry, Mohamed Allam
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Patent number: 5525916Abstract: 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: GrantFiled: April 10, 1995Date of Patent: June 11, 1996Assignee: The University of WaterlooInventors: Richard Gu, Mohamed Elmasry
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Patent number: 5302482Abstract: 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: GrantFiled: February 8, 1991Date of Patent: April 12, 1994Assignee: Minnesota Mining and Manufacturing CompanyInventors: Mohamed A. Elmasry, Kevin M. Kidnie, Susan K. Jongewaard, Gregory L. Zwadlo
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Patent number: 5075352Abstract: 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: GrantFiled: August 30, 1990Date of Patent: December 24, 1991Assignee: Minnesota Mining and Manufacturing CompanyInventor: Mohamed A. Elmasry
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Patent number: 5066559Abstract: 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: GrantFiled: January 22, 1990Date of Patent: November 19, 1991Assignee: Minnesota Mining and Manufacturing CompanyInventors: Mohamed A. Elmasry, Kevin M. Kidnie
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Patent number: 5061583Abstract: 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: GrantFiled: January 19, 1990Date of Patent: October 29, 1991Assignee: Minnesota Mining and Manufacturing CompanyInventors: Gregory L. Zwadlo, Kevin M. Kidnie, Mohamed A. Elmasry
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Patent number: 4988602Abstract: 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: GrantFiled: April 18, 1990Date of Patent: January 29, 1991Assignee: Minnesota Mining and Manufacturing Co.Inventors: Susan K. Jongewaard, Mohamed A. Elmasry, Kevin M. Kidnie
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Patent number: 4978598Abstract: 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: GrantFiled: March 8, 1990Date of Patent: December 18, 1990Assignee: Minnesota Mining and Manufacturing CompanyInventors: Mohamed A. Elmasry, Kevin M. Kidnie
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Patent number: 4946753Abstract: 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: GrantFiled: December 2, 1988Date of Patent: August 7, 1990Assignee: Minnesota Mining and Manufacturing CompanyInventors: Mohamed A. Elmasry, Gregory L. Zwadlo, Kevin M. Kednee
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Patent number: 4925766Abstract: 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: GrantFiled: December 2, 1988Date of Patent: May 15, 1990Assignee: Minnesota Mining and Manufacturing CompanyInventors: Mohamed A. Elmasry, Kevin M. Kidnie
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Patent number: 4822643Abstract: 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: GrantFiled: June 30, 1987Date of Patent: April 18, 1989Assignee: Minnesota Mining and Manufacturing CompanyInventors: Hsin-Hsin Chou, Mohamed A. Elmasry, Jeffrey C. Chang, Kevin M. Kidnie
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Patent number: 4739029Abstract: 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: GrantFiled: April 16, 1987Date of Patent: April 19, 1988Assignee: Minnesota Mining and Manufacturing CompanyInventor: Mohamed A. Elmasry
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Patent number: 4680375Abstract: 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: GrantFiled: March 11, 1985Date of Patent: July 14, 1987Assignee: Minnesota Mining and Manufacturing CompanyInventor: Mohamed A. Elmasry
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Patent number: 4666819Abstract: 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: GrantFiled: March 11, 1985Date of Patent: May 19, 1987Assignee: Minnesota Mining and Manufacturing CompanyInventor: Mohamed A. Elmasry
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Patent number: 4619990Abstract: 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: GrantFiled: March 11, 1985Date of Patent: October 28, 1986Assignee: Minnesota Mining and Manufacturing CompanyInventor: Mohamed A. Elmasry