Patents Represented by Attorney, Agent or Law Firm Howard J. Troffkin
  • Oxygen scavenging composition for low temperature use
    Patent number: 5648020
    Abstract: Improved compositions for scavenging oxygen are disclosed. These materials, characterized by low degree crystallinity and a glass transition temperature of lower than -15.degree. C., have high oxygen scavenging rates at low temperatures. The composition comprises an ethylenically unsaturated hydrocarbon and a transition metal salt catalyst and can be incorporated into various types of layers. It is preferable that the composition be incorporated into layers of multilayered articles used for packaging oxygen-sensitive products such as food products.
    Type: Grant
    Filed: December 6, 1995
    Date of Patent: July 15, 1997
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Drew Ve Speer, William Peyton Roberts
  • Cement admixture product having improved rheological properties and process of forming same
    Patent number: 5643978
    Abstract: The present invention is directed to an imidized polycarboxylic acid polymer useful as a cement admixture, to improved cement compositions containing said polymer and to a process of forming the same.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: July 1, 1997
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: David Charles Darwin, Ellis Martin Gartner, Byong-Wa Chun, Hideo Koyata, Lawrence Lu Kuo
  • Composition and method for inhibiting drying shrinkage of concrete
    Patent number: 5626663
    Abstract: A concrete composition capable of inhibiting shrinkage of structural concrete structures is disclosed. The concrete is formed with an admixture composed of at least one secondary/tertiary alkanediol.
    Type: Grant
    Filed: August 23, 1995
    Date of Patent: May 6, 1997
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Neal S. Berke, Michael P. Dallaire, Awdhoot V. Kerkar
  • Composition and method for degradation of nitroaromatic contaminants
    Patent number: 5618427
    Abstract: A method of creating an environment which promotes degradation of nitroaromatic organic chemical contaminants in water, sediment, or soil by adding a combination of fibrous organic matter and certain multi-valent metal particles to the water, sediment or soil.
    Type: Grant
    Filed: December 12, 1995
    Date of Patent: April 8, 1997
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Alan G. Seech, James E. Cairns, Igor J. Marvan
  • Cement composition
    Patent number: 5618344
    Abstract: A cement admixture composed of a mixture of certain lower alkyl ether oxyalkylene adducts with certain higher alkylene diols to provide cement compositions of mortar and concrete which inhibit drying shrinkage while permitting substantial air entrainment and enhanced compressive strength.
    Type: Grant
    Filed: November 6, 1995
    Date of Patent: April 8, 1997
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Awdhoot V. Kerkar, Neal S. Berke, Michael P. Dallaire
  • Drying shrinkage cement admixture
    Patent number: 5604273
    Abstract: The subject invention is directed to a cement admixture composition composed of certain alkylene glycols and copolymers of alkenyl ether and maleic anhydride. The present admixture provides a means to inhibit drying shrinkage of cement compositions while enhancing the compressive strength of the set composition.
    Type: Grant
    Filed: September 18, 1995
    Date of Patent: February 18, 1997
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Awdhoot V. Kerkar, Brian S. Gilbert
  • Method for inhibition of oxygen corrosion in aqueous systems by the use of a tannin activated oxygen scavenger
    Patent number: 5587109
    Abstract: A method of treating an aqueous system is described which comprises incorporating in the system a hydroxylamine derivative of the general formula: ##STR1## wherein each of R.sub.1, R.sub.2 and R.sub.3 which may be the same or different represents hydrogen, alkyl of 1 to 8 carbon atoms or aryl or a water soluble salt thereof or a precursor thereof, and a tannin in a weight ratio of at least 2:1. This is particularly useful for boiler water systems.
    Type: Grant
    Filed: April 19, 1995
    Date of Patent: December 24, 1996
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Brian Greaves, Stephen C. Poole, Chih M. Hwa, Joseph C. Fan
  • Cement and cement composition having improved rheological properties
    Patent number: 5583183
    Abstract: An improved hydraulic cement and resultant hydraulic cement composition having an imidized acrylic polymer uniformly distributed therein.
    Type: Grant
    Filed: February 27, 1995
    Date of Patent: December 10, 1996
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: David C. Darwin, Ellis M. Gartner, Byong-Wa Chun, Hideo Koyata, Lawrence L. Kuo
  • Cement admixture
    Patent number: 5571319
    Abstract: A fluid, stable aqueous dispersion of silica fume and alkali or alkaline earth metal nitrite salt. The dispersion contains a water soluble alkylene glycol.
    Type: Grant
    Filed: September 18, 1995
    Date of Patent: November 5, 1996
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Neal S. Berke, Michael P. Dallaire
  • Process for preparing photosensitive resin composition
    Patent number: 5565302
    Abstract: The present invention provides a process of preparing a waterborne photosensitive resin composition, free of organic solvent, that can be developed with aqueous alkali solution. The method of the present invention is a process for preparing a waterborne photosensitive resin composition, that can form a photosensitive article developable with aqueous alkali solution, by adding an unsaturated compound, a surfactant and a photoinitiator to an aqueous emulsion, and agitating under conditions sufficient to absorb the unsaturated compound into the polymeric particles of the emulsion and to form a stable waterborne photosensitive resin composition.
    Type: Grant
    Filed: April 21, 1995
    Date of Patent: October 15, 1996
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Hiroshi Samukawa, Katsue Nishikawa, Yoshichi Hagiwara
  • Drying shrinkage cement admixture
    Patent number: 5556460
    Abstract: A cement admixture composed of a low molecular weight oxyalkylene compound and a comb polymer having carboxylic acid groups and oxyalkylene units therein.
    Type: Grant
    Filed: September 18, 1995
    Date of Patent: September 17, 1996
    Assignee: W.R. Grace & Co.-Conn.
    Inventors: Neal S. Berke, Michael P. Dallaire, Ellis M. Gartner, Awdhoot V. Kerkar, Timothy J. Martin
  • Water-soluble cationic copolymers and their use as flocculants
    Patent number: 5529699
    Abstract: A method of flocculating coagulated and/or finely divided suspended matter in aqueous systems comprising adding to the system from 0.005 to 1 weight percent based on the dry weight of the coagulated and/or finely suspended matter of at least one water soluble cationic polymer selected from a water soluble cationic copolymer (I) composed of the polymerization reaction of an N-vinylamide with at least one cationic quaternary amine monomer.
    Type: Grant
    Filed: April 18, 1995
    Date of Patent: June 25, 1996
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Lawrence L. Kuo, Roger Y. Leung, Kenneth S. Williams
  • Method of producing water-soluble cationic copolymers
    Patent number: 5516852
    Abstract: A method of preparing a high molecular weight water-soluble cationic copolymer by reacting in an aqueous solution at least one N-vinylamide and at least one cationic quaternary amine monomer in the presence of a free radical initiator and a salt of ethylenediamine tetraacetic acid and subjecting the formed polymer to an acid or base to form an N-vinylamide/N-vinylamine/cationic quaternary amine copolymer product.
    Type: Grant
    Filed: April 18, 1995
    Date of Patent: May 14, 1996
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Lawrence L. Kuo, Roger Y. Leung, Kenneth S. Williams
  • Method of directly monitoring the concentrations of microbiocides in aqueous systems
    Patent number: 5514563
    Abstract: A method for directly measuring the concentration of biocides in aqueous systems comprising directly determining an absorbance or emission spectrum of the aqueous system in a wavelength range of from 200 to 2500 nm and applying chemometrics algorithms to the spectrum to determine the concentration of the biocides.
    Type: Grant
    Filed: March 3, 1993
    Date of Patent: May 7, 1996
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Jack C. Tully, Larry M. Kye
  • Compositions containing protease produced by vibrio and method of use in debridement and wound healing
    Patent number: 5505943
    Abstract: Compositions and methods of use are provided for debriding and wound healing applications.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: April 9, 1996
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Donald Z. Fortney, Donald R. Durham
  • Co-extraction of azadirachtin and neem oil
    Patent number: 5503837
    Abstract: Disclosed is an improved method of extracting neem seeds. The method involves co-solvent extracting neem seeds with a solvent mixture of a nonpolar, aliphatic hydrocarbon solvent and a polar solvent to simultaneously remove the hydrophilic and hydrophobic extracts from the neem seeds. The method provides novel neem extract mixtures which contain both the hydrophobic and hydrophilic portion of the neem seeds. The extract mixtures may be further extracted to yield an azadirachtin-containing solid product having greater than 10 weight percent of azadirachtin.
    Type: Grant
    Filed: September 23, 1994
    Date of Patent: April 2, 1996
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Michael T. Roland, John J. Blouin
  • High efficiency removal of low density lipoprotein-cholesterol from whole blood
    Patent number: 5496637
    Abstract: The present invention relates to the efficient removal of low density lipoprotein cholesterol complex (LDL-C) from whole blood. More specifically, it relates to a process for making a microporous plasmapheresis membrane having an immobilized affinity agent. The immobilized affinity agent is polyacrylic acid bound directly and/or through an interaction with silica and/or calcium chloride to a microporous hollow fiber membrane.
    Type: Grant
    Filed: April 30, 1993
    Date of Patent: March 5, 1996
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Marc E. Parham, Richard L. Duffy, Donald T. Nicholson
  • Composition for dehalogenation and degradation of halogenated organic contaminants
    Patent number: 5480579
    Abstract: A method of creating an environment which promotes dehalogenation and/or degradation of halogenated organic chemical contaminants in water, sediment, or soil by adding a combination of fibrous organic matter and certain multi-valent metal particles to the water, sediment or soil.
    Type: Grant
    Filed: February 13, 1995
    Date of Patent: January 2, 1996
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Alan G. Seech, James E. Cairns, Igor J. Marvan
  • Water-soluble cationic copolymers and their use as drainage retention aids in papermaking processes
    Patent number: 5473033
    Abstract: A method of preparing paper or paper board product from an aqueous pulp suspension comprising adding to the suspension an effective amount of a drainage retention aid composition of a) microparticles and b) at least one water soluble cationic polymer selected from a water soluble cationic copolymer composed of the polymerization reaction of an N-vinylamide with at least one cationic quaternary amine monomer.The copolymers of this invention are useful as useful as drainage/retention aids in pulp and papermaking operations.
    Type: Grant
    Filed: April 18, 1995
    Date of Patent: December 5, 1995
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Lawrence L. Kuo, Roger Y. Leung, Kenneth S. Williams
  • Porous membrane having single layer structure, battery separator made thereof, preparations thereof and battery equipped with same battery separator
    Patent number: 5453333
    Abstract: A porous membrane of a single layer structure formed from a first polymer having a melting point of at least 130.degree. C. and a second polymer having a melting point of up to 120.degree. C., wherein the walls of the pores of the membrane have an amount of second polymer insufficient to block the permeability of the pores under normal operating temperature conditions yet sufficient to do so when the membrane reaches a temperature equal to or greater than the second polymer's melting point.
    Type: Grant
    Filed: December 17, 1992
    Date of Patent: September 26, 1995
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Tsutomu Takauchi, Manabu Yamazaki, Yuichi Mori