Patents Represented by Attorney, Agent or Law Firm Howard J. Troffkin
  • Composition and method for controlling phosphonates tending to precipitate metal ions in water
    Patent number: 5453416
    Abstract: A method for controlling phosphonates which tend to precipitate with metal ions in water treatment operations comprising, adding to the water a water-soluble copolymer containing one or more of the following monomeric units:[a] ##STR1## in which: R is hydrogen or an alkyl group, R.sub.1 is an alkyl group and X is hydrogen, NH.sub.4.sup.+, a water soluble metal ion or organic base; and[b] a monocarboxylic acid monomer; and adding the copolymer to the water to be treated in an amount sufficient to prevent precipitation of said phosphonates.
    Type: Grant
    Filed: September 6, 1994
    Date of Patent: September 26, 1995
    Assignee: W. R. Grace & Co.-Conn.
    Inventor: Peter K. L. G. Thevissen
  • Dispersant composition for cement having excellent property in inhibition of slump-loss
    Patent number: 5432212
    Abstract: A cement admixture which when added to a cement composition, such as cement mortar or concrete inhibits slump-loss of the cement composition and improve its workability and applicability. The admixture is composed of copolymers from an alkenyl ether, a polyalkenyl ether and maleic anhydride.
    Type: Grant
    Filed: April 4, 1994
    Date of Patent: July 11, 1995
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Susumu Honda, Tadashi Hara, Hideo Koyata
  • Grinding aid composition and cement product
    Patent number: 5429675
    Abstract: A grinding aid composition suitable for grinding clinker into hydraulic cement powder, an improved grinding process and an improved cement product are disclosed. The grinding aid composition is composed of a mixture of at least one alkylene ether glycol and particulate carbon.
    Type: Grant
    Filed: August 22, 1994
    Date of Patent: July 4, 1995
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Josephine H. Cheung, Ellis M. Gartner
  • Method for dehalogenation and degradation of halogenated organic contaminants
    Patent number: 5411664
    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: September 24, 1993
    Date of Patent: May 2, 1995
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Alan G. Seech, James E. Cairns, Igor J. Marvan
  • Cement and cement composition having improved rheological properties
    Patent number: 5393343
    Abstract: An improved hydraulic cement and resultant hydraulic cement composition having an imidized acrylic polymer uniformly distributed therein.
    Type: Grant
    Filed: September 29, 1993
    Date of Patent: February 28, 1995
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: David C. Darwin, Ellis M. Gartner, Byong-Wa Chun, Hideo Koyata, Lawrence L. Kuo
  • Battery separator
    Patent number: 5389433
    Abstract: A battery separator composed of a microporous sheet product having first and second major surfaces and a thickness of less than about 50 mils, formed from a uniform mixture of a polysulfone polymer and a filler or polysulfone polymer and structure enhancing agent, said sheet product having a fibrous sheet embedded within said mixture and between the first and second major surfaces. The porosity of the sheet product is at least about 60 volume percent composed of pores such that the average pore diameter increases from each major surface toward the interior of the sheet product's thickness.
    Type: Grant
    Filed: April 1, 1993
    Date of Patent: February 14, 1995
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Victor S. C. Chang, Richard C. Hartwig, James K. Kung, Joseph T. Lundquist, Marc E. Parham, James A. Avtges, Anthony J. Laccetti
  • Low shrinkage cement composition
    Patent number: 5389143
    Abstract: The present invention relates to the use of .alpha., .beta.-amino alcohols as a cement admixture to inhibit drying shrinkage of resultant cement compositions.
    Type: Grant
    Filed: July 29, 1993
    Date of Patent: February 14, 1995
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Ismail Abdelrazig, Paul C. Scheiner
  • Battery separator
    Patent number: 5389463
    Abstract: A battery separator composed of a microporous sheet product having first and second major surfaces and a thickness of less than about 50 mils, formed from a uniform mixture of a halogenated polyolefin polymer and a filler or a halogenated polyolefin polymer and surfactant/filler agent, said sheet product having a fibrous sheet embedded within said mixture and between the first and second major surfaces. The porosity of the sheet product is at least about 50 volume percent composed of pores such that the average pore diameter increases from each major surface towards the interior of the sheet product's thickness.
    Type: Grant
    Filed: April 1, 1993
    Date of Patent: February 14, 1995
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Victor S. Chang, Richard T. Giovannoni, Richard C. Hartwig, Joseph T. Lundquist, Christian B. Lundsager, Marc E. Parham, Anthony J. Laccetti
  • Battery separator
    Patent number: 5362582
    Abstract: A battery separator composed of a microporous sheet product having first and second major surfaces and a thickness of less than about 50 mils, formed from a uniform mixture of a polymer and a filler or a polymer and a structure enhancing agent and having a porous sheet embedded between the first and second major surface. The porosity of the sheet product is at least about 50 volume percent having a pore distribution such that the nominal pore diameter increases from each major surface towards the interior central portion of the sheet product's thickness.
    Type: Grant
    Filed: April 1, 1993
    Date of Patent: November 8, 1994
    Assignee: W.R. Grace & Co.-Conn.
    Inventors: Victor S. Chang, Richard C. Hartwig, Joseph T. Lundquist, Marc E. Parham, James K. Kung, James A. Avtges, Anthony J. Laccetti
  • Battery separator
    Patent number: 5362581
    Abstract: A battery separator composed of a microporous sheet product having first and second major surfaces and a thickness of less than about 50 mils, formed from a uniform mixture of a polycarbonate polymer and a filler or a polycarbonate and a structure enhancing agent, said sheet product having a porous sheet embedded within said mixture and between the first and second major surfaces. The porosity of the sheet product is at least about 50 volume percent composed of pores such that the nominal pore diameter increases incrementally from each major surface towards the interior central portion of the sheet product's thickness.
    Type: Grant
    Filed: April 1, 1993
    Date of Patent: November 8, 1994
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Victor S. Chang, Richard C. Hartwig, Joseph T. Lundquist, Marc E. Parham, Anthony J. Laccetti
  • Cement admixture composition
    Patent number: 5362323
    Abstract: Cement admixture compositions formed from alkenyl ether/maleic anhydride copolymers having specific molecular structures have been found to impart a high degree of slump loss over a sustained period of time while not causing any significant set retardation of the treated cement based composition.
    Type: Grant
    Filed: February 9, 1993
    Date of Patent: November 8, 1994
    Assignees: W. R. Grace & Co. Conn., NOF Corporation
    Inventors: Hideo Koyata, Susumu Honda
  • Microporous polyurethane based battery separator
    Patent number: 5346788
    Abstract: A battery separator composed of a microporous sheet product having first and second major surfaces and a thickness of less than about 50 mils, formed from a uniform mixture of a thermoplastic polyurethane polymer having a high degree of hard segments with a filler or said polyurethane with a structure enhancing agent, said sheet product having a sheet embedded within said mixture and between the first and second major surfaces. The sheet product has porosity of at least about 50 volume percent composed of pores such that the nominal pore diameter increases from each major surface towards the interior, center of the sheet product's thickness.
    Type: Grant
    Filed: April 1, 1993
    Date of Patent: September 13, 1994
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Victor S. C. Chang, Richard C. Hartwig, Joseph T. Lundquist, Marc E. Parham, Anthony J. Laccetti
  • Vermiculite composition with improved thermal expansion properties
    Patent number: 5340558
    Abstract: A vermiculite composition capable of exhibiting a high degree of volume increase upon subjection to thermal exfoliation composed of vermiculite mineralogical species having specific gravity of from 2.5 g/cm.sup.3 to 2.9 g/cm.sup.3. Further, intumescent sheets formed with said vermiculite composition exhibit low initial expansion temperature and very high maximum expansion properties.
    Type: Grant
    Filed: June 14, 1993
    Date of Patent: August 23, 1994
    Assignee: W.R. Grace & Co.-Conn.
    Inventors: Semyon D. Friedman, Robert W. McKinney, Chia-Chih Ou, Robert M. Spotnitz, Shaohai Wu
  • Battery separator
    Patent number: 5336573
    Abstract: A thin microporous sheet product useful as a battery separator composed of a highly filled polymeric matrix having a porous support sheet encapsulated between the sheet product's first and second major surfaces and to a process of forming the sheet product.
    Type: Grant
    Filed: July 20, 1993
    Date of Patent: August 9, 1994
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: David Zuckerbrod, Richard T. Giovannoni
  • Vermiculite composition with improved chemical exfoliation
    Patent number: 5326500
    Abstract: A vermiculite composition composed of particulate vermiculite mineral species having a density of 2.3 g/cm.sup.3 to 2.7 g/cm.sup.3 which has intercalated cations of lithium or organo ammonium and to dispersions obtained therefrom.
    Type: Grant
    Filed: June 14, 1993
    Date of Patent: July 5, 1994
    Assignee: W.R. Grace & Co.-Conn.
    Inventors: Semyon D. Friedman, Robert W. McKinney, Chia-Chih Ou, Robert M. Spotnitz, Shaohai Wu
  • Low shrinkage cement composition
    Patent number: 5326396
    Abstract: The present invention is directed to a cement admixture and the resultant cement composition capable of inhibiting drying shrinkage and crack formation resulting therefrom.
    Type: Grant
    Filed: July 29, 1993
    Date of Patent: July 5, 1994
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Baha E. I. Abdelrazig, Ellis M. Gartner, David F. Myers
  • Low shrinkage cement composition
    Patent number: 5326397
    Abstract: A cement composition capable of inhibiting drying shrinkage and cracking resulting therefrom composed of cement and an alkyl or cycloalkyl carbamate, an alkylene dicarbamate, polyoxyalkylene dicarbamate or mixtures thereof.
    Type: Grant
    Filed: July 29, 1993
    Date of Patent: July 5, 1994
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Baha E. I. Abdelrazig, Ellis M. Gartner, David F. Myers
  • Hydrogenation of nitroalkanes to hydroxylamines
    Patent number: 5288907
    Abstract: Catalytic hydrogenation of nitroalkane to N-alkylhydroxylamine free base in the absence of transition metal ions, and omission of acid and the resultant free base is storage stable, permitting shipment and storage of 15% aqueous solution for use as oxygen scavenger in boiler feed water treatment.
    Type: Grant
    Filed: October 30, 1991
    Date of Patent: February 22, 1994
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Martin B. Sherwin, Puvin Pichaichanarong
  • Battery separator
    Patent number: 5281491
    Abstract: The present invention is directed to a multi-ply unfilled microporous sheet product composed of at least one first ply and at least one second ply which are, respectively, formed from polymeric compositions having different rheological properties and to a method of forming said sheet product.
    Type: Grant
    Filed: December 20, 1991
    Date of Patent: January 25, 1994
    Assignee: W. R. Grace & Co.
    Inventors: Burton M. Rein, Howard J. Troffkin, Robert M. Spotnitz, Richard T. Giovannoni, Yihong Guo
  • Battery separators with T-shaped ribs
    Patent number: 5264304
    Abstract: A sheet product useful as a battery separator in the form of a microporous base sheet having spaced T-shaped (cross-sectional) ribs extending from one surface of the base sheet.
    Type: Grant
    Filed: September 23, 1991
    Date of Patent: November 23, 1993
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Eric D. Kragness, Joseph T. Lundquist