Patents Represented by Attorney Gordon L. Hart

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  • Chemical lighting device
    Patent number: 4379320
    Abstract: In chemical light devices comprising a chemi-luminescent mixture with a first fluorescer contained in a transparent or translucent container, a second fluorescer is incorporated in the walls of the container to shift at least part of the emissions from the device from the shorter wavelength emission of the first fluorescer to a longer wavelength emission of the second fluorescer. The second fluorescer has an absorption spectrum substantially overlapping the emission spectrum of the first fluorescer. The shift is usually about 20 to 100 nanometers and may be as much as 200 nanometers.
    Type: Grant
    Filed: February 19, 1981
    Date of Patent: April 5, 1983
    Assignee: American Cyanamid Company
    Inventors: Arthur G. Mohan, Michael M. Rauhut
  • Urethane-modified rosin ester and process for preparing the same
    Patent number: 4377510
    Abstract: A urethane-modified ester of rosin and a primary polyhydric alcohol has negligible hydroxyl content and is particularly useful as a polar tackifier in an adhesive composition made with a polar elastomer. The modified ester is prepared by reacting a rosin ester, for example, a rosin-pentaerythritol ester which contains some residual hydroxyl groups with a suitable isocyanate or diisocyanate.
    Type: Grant
    Filed: November 30, 1981
    Date of Patent: March 22, 1983
    Assignee: Arizona Chemical Company
    Inventors: Erwin R. Ruckel, Martin Epstein
  • Electrochromic cells with improved electrolyte system
    Patent number: 4375318
    Abstract: Electrochromic devices are described having a layer of electrochromic material, e.g. WO.sub.3, in contact with a layer of organic electrolyte resin, with electrode means for changing electrochromic properties of the device by electric field means. The electrolyte resin layer comprises a hydrophilic layer of homopolymer of poly(2-acrylamido-2-methylpropanesulfonic acid) with an organic humectant and in some preferred embodiments may further comprise a thinner layer of less hydrophilic electrolyte resin between the homopolymer and electrochromic layers.
    Type: Grant
    Filed: July 30, 1980
    Date of Patent: March 1, 1983
    Assignee: American Cyanamid Company
    Inventors: Robert D. Giglia, Sun Y. Huang
  • Compound: d-N-(2-amino-2-phenethyl)-2-methoxyethylamine and process for preparing the same by selective crystallization
    Patent number: 4370500
    Abstract: There is provided a new compound: d-N-(2-amino-2-phenethyl-2-methoxyethylamine useful in the direct synthesis of levamisole. The compound is prepared by slurrying the racemic N-(2-amino-2-phenethyl)-2-methoxyethylamine with dibenzoyl-d-tartaric acid as the resolving agent in an aqueous acidic menstruum containing ammonium chloride, heating the resultant mixture, preferably under reflux, cooling and filtering the resultant mixture to recover crystals rich in the desired d-amine compound, hereinabove noted.
    Type: Grant
    Filed: November 6, 1978
    Date of Patent: January 25, 1983
    Assignee: American Cyanamid Company
    Inventor: Nancy S. Kurose
  • Sulfonated rubrene and aqueous chemiluminescent compositions containing the same
    Patent number: 4366079
    Abstract: Water-soluble sulfonated rubrenes are used as fluorescer components in water-soluble chemiluminescent mixtures and particularly in combination with a water-soluble amide of oxalic acid which reacts with hydrogen peroxide to produce chemiluminescence.
    Type: Grant
    Filed: February 26, 1981
    Date of Patent: December 28, 1982
    Assignee: American Cyanamid Company
    Inventors: Michael M. Rauhut, Arthur G. Mohan
  • Electrochromic device containing acid copolymer electrolyte
    Patent number: 4361385
    Abstract: In electrochromic devices having a layer of electrochromic material, e.g. tungsten oxide, in contact with a polymeric electrolyte layer, the stability and speed of the device are improved by using a copolymer of 2-acrylamido-2-methylpropanesulfonic acid and vinyl sulfonic acid as the polymeric electrolyte.
    Type: Grant
    Filed: October 23, 1980
    Date of Patent: November 30, 1982
    Assignee: American Cyanamid Company
    Inventors: Sun Y. Huang, Robert D. Giglia
  • Electrochromic display device with improved erasing characteristic
    Patent number: 4344674
    Abstract: An electrochromic device having an electrochromic layer of persistent electrochromic material such as tungsten oxide, and an electrolyte layer and a counter electrode which comprises an oxidizing agent which has oxidizing electrode potential more negative than the electrochromic layer to provide a stored charge for erasing color from the electrochromic layer, and to increase the emf of the charge used for the erase function. Examples of suitable oxidizing agents are manganese dioxide and chromic oxide.
    Type: Grant
    Filed: July 18, 1980
    Date of Patent: August 17, 1982
    Assignee: American Cyanamid Company
    Inventor: Robert D. Giglia
  • Process for converting optically active l-N-(2-amino-2-phenethyl)-2-methoxyethylamine to the corresponding dl-derivative
    Patent number: 4339603
    Abstract: There is provided a process for racemizing an undesirable, optically active compound for conversion to levamisole, namely, l-N-(2-amino-2-phenethyl)-2-methoxyethylamine, by converting the latter to optically active l-(2-methoxyethyl)-4-phenyl-2-imidazolidone, which is next converted to the corresponding optically inactive imidazolidone derivative, which derivative is hydrolyzed to the optically inactive racemate, dl-N-(2-amino-2-phenethyl)-2-methoxyethylamine. The latter can be resolved to obtain the d and l components of the racemate, the d component being utilized directly in levamisole synthesis and the l component being again subjected to the above procedure.
    Type: Grant
    Filed: January 8, 1979
    Date of Patent: July 13, 1982
    Assignee: American Cyanamid Company
    Inventors: Sivaraman Raghu, Arnold Zweig
  • Aqueous chemiluminescent systems
    Patent number: 4338213
    Abstract: Quaternary salts of N,N'-bis(morpholinoalkyl)-N,N'-bis(trifluoromethylsulfonyl)oxamides and of N,N'-bis(pyridylalkyl)-N,N'-bis(trifluoromethylsulfonyl)oxamides are useful for generation of chemiluminescence by reaction with hydrogen peroxide in aqueous solvent.
    Type: Grant
    Filed: April 13, 1981
    Date of Patent: July 6, 1982
    Assignee: American Cyanamid Company
    Inventors: Shin-Shyong Tseng, Michael M. Rauhut
  • Preparation of hardened tall oil pitch
    Patent number: 4337193
    Abstract: Additives to tall oil pitch react to cause crosslinking which improves hardness, viscosity, tackiness, etc., properties of the modified pitch. Additives include for example maleic anhydride, wood flour, formylated melamine, phenol and other resins, diisocyanates, alcohols and the like. The modified pitch has properties improved for use as binders for briquetting adhesives, etc.
    Type: Grant
    Filed: April 27, 1981
    Date of Patent: June 29, 1982
    Assignee: Arizona Chemical Company
    Inventor: Jeno G. Szita
  • Electrochromic cells with improved electrolyte system
    Patent number: 4335938
    Abstract: Electrochromic devices are described having a layer of electrochromic material, e.g. WO.sub.3, in contact with a layer of organic electrolyte resin, with electrode means for changing electrochromic properties of the device by electric field means. The electrolyte resin layer comprises a hydrophilic layer of homopolymer of poly(2-acrylamido-2-methylpropane sulfonic acid) and in some preferred embodiments may further comprise a thinner layer of less hydrophilic electrolyte resin between the homopolymer and electrochromic layers.
    Type: Grant
    Filed: August 30, 1979
    Date of Patent: June 22, 1982
    Assignee: American Cyanamid Company
    Inventors: Robert D. Giglia, Sun Y. Huang
  • Multilayered electroplatographic element comprising ion conductive and electrochromic layers
    Patent number: 4324622
    Abstract: Electrophotographic element typically comprising in sandwiched arrangement a transition metal oxide layer and a photoconductive layer. When an electric field is applied across the element, preferably after inserting the element between a pair of electrode layers, and an optical image is projected onto the photoconductive layer, the resulting conductivity pattern in the photoconductive layer causes corresponding coloration in the transition metal oxide layer, thereby visibly recording the optical image.
    Type: Grant
    Filed: March 7, 1977
    Date of Patent: April 13, 1982
    Assignee: American Cyanamid Company
    Inventor: Satyendra K. Deb
  • Superior oxalate ester chemical lighting system
    Patent number: 4313843
    Abstract: This invention relates to a chemiluminescent lighting system of practical value and superior properties, having good storage stability.
    Type: Grant
    Filed: September 9, 1976
    Date of Patent: February 2, 1982
    Assignee: American Cyanamid Company
    Inventors: Laszlo J. Bollyky, Michael M. Rauhut
  • Processes for preparing 3,5,6-trichlorosalicylic acid and esters thereof
    Patent number: 4308395
    Abstract: An improved single-pot process for synthesis of 3,5,6-trichlorosalicylic acid and esters thereof is described. Salicylic acid is chlorinated first in concentrated sulfuric acid and then with iodine catalyst to make the trichlorosalicylic acid which is extracted and then reacted with an alcohol to make the ester.
    Type: Grant
    Filed: July 11, 1980
    Date of Patent: December 29, 1981
    Assignee: American Cyanamid Company
    Inventors: Robert J. Manfre, Arthur G. Mohan, Michael M. Rauhut
  • Device for warning of impending roof-fall in underground excavations
    Patent number: 4299185
    Abstract: Apparatus for activation of a chemical lightstick by downward sag of a mine roof is described. Through a spool and collar at the mine roof, two wires are extended from an anchor set in a stable formation above the roof, and are tied to a lightstick below the collar and spool. Pathways for passage of the two wires through the spool are provided so the wires are outside a center opening in the spool but are inside the outermost diameter of the neck of the spool. A spring-loaded embodiment permits the apparatus to tolerate a measured sag without activating the lightstick.
    Type: Grant
    Filed: November 21, 1979
    Date of Patent: November 10, 1981
    Assignee: American Cyanamid Company
    Inventors: William R. Heffernan, Mary-Louise Vega, Joel A. Gingras, Sr.
  • Use of hollow glass spheres in conjunction with rehydratable alumina for making low density catalyst support beads
    Patent number: 4292206
    Abstract: For making low density alumina or silica-alumina beads as catalyst support particles for auto-exhaust catalysts, hollow glass spheres of very small diameter are incorporated in the alumina powder mix before it is formed into beads and calcined. The beads may be finished with a surface coat of alumina without the microspheres to improve resistance to abrasion. Preferred beads are made with rehydratable alumina powder.
    Type: Grant
    Filed: August 22, 1980
    Date of Patent: September 29, 1981
    Assignee: American Cyanamid Company
    Inventors: Robert E. Barnes, Jr., Venkatrao Pai
  • Settling out suspended solids in phosphoric acid product solutions
    Patent number: 4291005
    Abstract: For settling suspended solids in phosphoric acid product solutions, a copolymer of 95 mole percent ammonium acrylate monomer, 5% acrylamide monomer is shown to remove more solids than prior art flocculants when used in equivalent dosage, and to remove equivalent solids at much less dosage.
    Type: Grant
    Filed: April 23, 1979
    Date of Patent: September 22, 1981
    Assignee: American Cyanamid Company
    Inventors: Andrew C. Poulos, Michael J. Thibodeau
  • Process for preparing amides by reaction in presence of molecular sieve
    Patent number: 4288592
    Abstract: There is provided a process for preparing amides which comprises reacting an amine, or an amide, and an acid halide, or anhydride, in suitable molecular proportions, in an inert organic diluent, in the presence of an effective amount of a molecular sieve, until the reaction is completed, separating the molecular sieve, and recovering the amide from the organic mother liquor.
    Type: Grant
    Filed: April 30, 1979
    Date of Patent: September 8, 1981
    Assignee: American Cyanamid Company
    Inventors: Michael M. Rauhut, Shin-Shyong Tseng
  • Aqueous chemiluminescent systems
    Patent number: 4282357
    Abstract: Quaternary salts of N,N'-bis(morpholinoalkyl)-N,N'-bis(trifluoromethylsulfonyl)oxamides and of N,N'-bis(pyridylalkyl)-N,N'-bis(trifluoromethylsulfonyl)oxamides are useful for generation of chemiluminescence by reaction with hydrogen peroxide in aqueous solvent.
    Type: Grant
    Filed: February 19, 1980
    Date of Patent: August 4, 1981
    Assignee: American Cyanamid Company
    Inventors: Shin-Shyong Tseng, Michael M. Rauhut
  • Self-supporting pigment layers for electrochromic display
    Patent number: RE30835
    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 self-supporting ion-conductive layer between.
    Type: Grant
    Filed: October 27, 1976
    Date of Patent: December 29, 1981
    Assignee: American Cyanamid Company
    Inventor: Robert D. Giglia