Patents Represented by Attorney Gordon L. Hart

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  • Stabilization of acrylamide solutions
    Patent number: 4233240
    Abstract: Acrylamide aqueous solutions when stored in closed containers without constant supply of oxygen as polymerization inhibitor will polymerize during storage. To extend the safe period of storage under these conditions, cupric ion at concentrations from 0.5 to about 10 parts per million parts acrylamide in the solution is used as a polymerization inhibitor.
    Type: Grant
    Filed: February 14, 1977
    Date of Patent: November 11, 1980
    Assignee: American Cyanamid Company
    Inventors: William F. Linke, William F. Marzluff
  • Melamine-monophthalimides
    Patent number: 4226989
    Abstract: Melamine monophthalimides and its halogenated derivatives are novel compounds having utility as plasticizers or fire retardants in resin composition.
    Type: Grant
    Filed: July 19, 1979
    Date of Patent: October 7, 1980
    Assignee: American Cyanamid Company
    Inventors: Roland R. Dileone, Jeno G. Szita
  • N,N-Bis(trifluoromethylsulfonyl)oxamides and chemiluminescent compositions containing the same
    Patent number: 4226738
    Abstract: N,N'-bis(trifluoromethylsulfonyl)oxamides are described with a number of variations by substitution at the amido nitrogen atoms. These compounds when used in chemiluminescent formulations will furnish superior light intensity and quantum efficiency. Preparation of compounds and their use for chemiluminescence are described.
    Type: Grant
    Filed: November 1, 1978
    Date of Patent: October 7, 1980
    Assignee: American Cyanamid Company
    Inventors: Michael M. Rauhut, Shin-Shyong Tseng, Arthur G. Mohan
  • Ion exchange-electrolyte layer for electrochromic devices
    Patent number: 4215917
    Abstract: Disclosed is an electrochromic variable light modulating device including an improved ion conducting medium comprising a solid or semi-solid layer of polymer of the ion exchange type wetted with a small amount of water and/or acid electrolyte solution.
    Type: Grant
    Filed: October 27, 1976
    Date of Patent: August 5, 1980
    Assignee: American Cyanamid Company
    Inventors: Robert D. Giglia, Thomas B. Reddy
  • Electrochromic devices having protective interlayers
    Patent number: 4193670
    Abstract: The incorporation of one or more protective layers between the electrochromic material and the polymeric electrolyte in an electrochromic device produces longer lasting, more uniform devices. The further placing of a protective layer between the electrolyte and the counterelectrode yields still better devices.
    Type: Grant
    Filed: November 8, 1977
    Date of Patent: March 18, 1980
    Assignee: American Cyanamid Company
    Inventors: Robert D. Giglia, Richard H. Clasen
  • Personnel marker device
    Patent number: 4193109
    Abstract: A one-piece chemiluminescent lightstick tube with attached actuating device is protected in storage by an opaque sleeve slipped over the outside of the tube. The sleeve is cut away to pass the attachment and may be fitted with a fastening device such as a clip or pin.
    Type: Grant
    Filed: September 22, 1978
    Date of Patent: March 11, 1980
    Assignee: American Cyanamid Company
    Inventors: William R. Heffernan, Mary-Louise Vega, Edward T. Rockwell, Sr.
  • Emergency lighting device
    Patent number: 4186426
    Abstract: A chemiluminescent lightstick with an attached actuating device is stored inside a container having a hinged lid which opens for access to and for display of the lightstick. The container comprises clamping means by which the lightstick is held at a display position in the open container. The lightstick as clamped in the display position holds open the lid of the container. In this mode, the lightstick and container make a convenient lantern.
    Type: Grant
    Filed: December 19, 1977
    Date of Patent: January 29, 1980
    Assignee: American Cyanamid Company
    Inventors: Joel A. Gingras, Sr., William R. Heffernan, Mary-Louise Vega, Michael T. Beachem
  • Multi-purpose lantern
    Patent number: 4184193
    Abstract: A lantern is described in which a chemiluminescent lightstick serving as the light source is held in place before a curved reflective sheet for projection of the light through a window of the lantern.
    Type: Grant
    Filed: June 14, 1978
    Date of Patent: January 15, 1980
    Assignee: American Cyanamid Company
    Inventors: William R. Heffernan, Mary-Louise Vega, Joel A. Gingras, Sr.
  • Microcrystalline cellulose as extrusion aid/combustible filler for alumina
    Patent number: 4180411
    Abstract: The use of microcrystalline cellulose as an extrusion aid/combustible filler for rehydratable alumina allows the production of low density alumina substrates.
    Type: Grant
    Filed: July 28, 1978
    Date of Patent: December 25, 1979
    Assignee: American Cyanamid Company
    Inventors: Robert H. Whitman, William A. Barber
  • Catalyst for hydration of nitriles
    Patent number: 4178310
    Abstract: Solid catalyst of reduced copper magnesium silicate type is improved for its use in catalytic hydration of acrylonitrile to make acrylamide by calcining the catalyst prior to such use. Calcining strengthens the catalyst particles for longer catalyst life in the reactor and slows the rate of decay of catalytic activity so the average productivity over the life of the catalyst is improved.
    Type: Grant
    Filed: August 30, 1976
    Date of Patent: December 11, 1979
    Assignee: American Cyanamid Company
    Inventors: John A. Fetchin, Kin H. Tsu
  • Electrochromic devices with polymeric electrolytes
    Patent number: 4174152
    Abstract: Improved electrochromic devices result from the incorporation of novel polymeric electrolytes. The electrolytes are based upon copolymers prepared from vinyl monomers and acid-group-containing monomers.
    Type: Grant
    Filed: February 13, 1978
    Date of Patent: November 13, 1979
    Assignee: American Cyanamid Company
    Inventors: Robert D. Giglia, John A. Sedlak, David W. Lipp
  • Cationic and amphoteric surfactants
    Patent number: 4171418
    Abstract: Novel water-soluble acrylamide copolymers contain 40 to 70 percent by weight acrylamide units, at least 30 percent of hydrophobic vinyl units and at least 10 percent of vinyl units having ionic properties. In aqueous solution these copolymers have the properties of cationic or amphoteric surface active agents.
    Type: Grant
    Filed: November 22, 1977
    Date of Patent: October 16, 1979
    Assignee: American Cyanamid Company
    Inventors: Girish C. Barua, Daniel E. Nagy
  • Electrochromic devices having protective interlayers
    Patent number: 4170406
    Abstract: The incorporation of a non-electrochromic layer between the electrochromic material and the electrolyte in an electrochromic device produces longer lasting, more uniform devices.
    Type: Grant
    Filed: November 14, 1977
    Date of Patent: October 9, 1979
    Assignee: American Cyanamid Company
    Inventors: Robert D. Giglia, Richard H. Clasen
  • Process for preparing shaped particles from rehydratable alumina
    Patent number: 4169874
    Abstract: Disclosed is a process for preparing shaped alumina particles for catalysts or catalyst supports by passing droplets of an aqueous slurry of a rehydratable alumina composition through a shaping medium, such as a column of water-immiscible liquid. The alumina composition undergoes rehydration while being shaped as it passes through the shaping medium, and accordingly, firm, discrete alumina bodies are produced.
    Type: Grant
    Filed: November 21, 1977
    Date of Patent: October 2, 1979
    Assignee: American Cyanamid Company
    Inventor: William E. Bambrick
  • Processing of acrylamide solutions; concentration without polymer formation
    Patent number: 4163755
    Abstract: Use of copper ion in acrylamide solution during concentration to inhibit polymerization.
    Type: Grant
    Filed: January 13, 1977
    Date of Patent: August 7, 1979
    Assignee: American Cyanamid Company
    Inventors: Ken Matsuda, Martin S. Butensky, Kin H. Tsu, Robert J. Munch
  • Catalyst preparation method
    Patent number: 4163735
    Abstract: Copper-magnesium silicate-carbonate catalysts of improved activity and catalyst life for use in continuous hydration of acrylonitrile to acrylamide are prepared by a novel method in which magnesium and copper are precipitated separately in a common mother liquor and the precipitate is separated and dried at 170.degree.-200.degree. C. before pelleting. Pellets made from the dried powder, when reduced and calcined for use in the hydration reaction have better combination of catalytic properties than prior art catalysts of the type.
    Type: Grant
    Filed: July 25, 1977
    Date of Patent: August 7, 1979
    Assignee: American Cyanamid Company
    Inventors: John A. Fetchin, William F. Marzluff
  • Hydrotreating catalysts
    Patent number: 4139492
    Abstract: Catalysts for hydrotreating of petroleum refinery feedstocks are prepared by impregnating an aqueous solution of Group VI metal compound and Group VIII metal compound in solution with HBF.sub.4 on catalyst support of alumina or alumina with silica. In preferred embodiments, oxides of molybdenum and nickel in solution with HBF.sub.4, and optionally also with H.sub.3 PO.sub.4, are impregnated on alumina and calcined to finish the catalyst. Catalysts so prepared are used in hydrotreating to reduce nitrogen content of oil feedstocks.
    Type: Grant
    Filed: August 10, 1977
    Date of Patent: February 13, 1979
    Assignee: American Cyanamid Company
    Inventors: Ronald J. Polard, John D. Voorhies
  • Multiplex addressing of electrochromic displays
    Patent number: 4129861
    Abstract: An electrochromic data display and imaging device which may be formed by sandwich arrangement of the imaging area and the counter-electrode area with a suitable ion-conducting layer between.The imaging area is in the form of discrete electrochromic areas in a desired pattern, and a circuit is provided for multiplexing these areas to provide alphanumeric or other type displays.
    Type: Grant
    Filed: January 27, 1976
    Date of Patent: December 12, 1978
    Assignee: American Cyanamid Company
    Inventor: Robert D. Giglia
  • Process for sizing and desliming of ore matrix
    Patent number: 4126275
    Abstract: A method of processing hydraulically mined ore slurries containing, in addition to the valuable ore, substantial quantities of contaminating argillaceous material and silica, involving initially separating the argillaceous material from the ore slurry while concomitantly concentrating said slurry to at least 65% solids content, depositing the wet concentrate thus formed on a continuous belt and conveying said wet concentrate via said belt to a beneficiation plant for further treatment.
    Type: Grant
    Filed: July 18, 1977
    Date of Patent: November 21, 1978
    Assignee: American Cyanamid Company
    Inventors: Richard C. Timberlake, U. K. Custred
  • Hydrotreating of petroleum distillates using shaped catalyst particles
    Patent number: RE30155
    Abstract: There is disclosed a hydrotreating process for petroleum distillate which comprises contacting the distillate with catalyst particles of special shape characteristics in the presence of hydrogen at elevated temperature and pressure.
    Type: Grant
    Filed: November 3, 1978
    Date of Patent: November 20, 1979
    Assignee: American Cyanamid Company
    Inventor: William R. Gustafson