Patents Examined by Allan Lieberman
  • Composition friction element for a railroad brake shoe
    Patent number: 4313869
    Abstract: A railroad brake shoe may include a friction element made by combining a number of materials so as to produce the required frictional characteristics for railroad braking. Heretofore, such friction elements commonly contained materials such as lead and asbestos. These two elements may have toxic characteristics under certain circumstances and therefore are suspect. To safely handle these suspect materials has thus become most difficult and expensive. By this invention, a composition friction element, which meets the requirements of the railroad industry, includes a substantially reduced suspect material content, yet is competitive in performance and cost with other known products.
    Type: Grant
    Filed: May 19, 1980
    Date of Patent: February 2, 1982
    Assignee: AMSTED Industries Incorporated
    Inventor: John B. Littlefield
  • High concentration polymer slurries
    Patent number: 4312675
    Abstract: High concentration polymer slurries contain up to 65 weight % xanthan gum in a hydrophobic solvent base treated with suspending agents, dispersants, and thinning agents. Mineral oil, diesel oil, kerosene, alcohols (six to twelve carbons), vegetable oil, ester-alcohols, polyol ethers, and the like may be used as the solvent. The preferred suspending agent is either an organophilic clay or hydroxypropyl cellulose. The preferred dispersant is either an ethoxylated linear alcohol or a fatty acid ester of vegetable oil or animal oil. The preferred thinning agent is lecithin. These slurries greatly improve the dispersibility of xanthan gum or any other hydrophilic colloid, such as guar, hydroxypropyl guar, cellulosics, polyacrylamides, and the like.
    Type: Grant
    Filed: April 21, 1980
    Date of Patent: January 26, 1982
    Assignee: Merck & Co., Inc.
    Inventors: Patrick A. Pickens, Thomas A. Lindroth, Robert D. Carico
  • Retro-reflective liquid coating composition
    Patent number: 4312676
    Abstract: A liquid coating composition that is useful to form retro-reflective marks that actuate photoscanner sensing devices and that comprises a liquid vehicle and retro-reflective elements uniformly dispersed in the vehicle. The vehicle includes a high proportion of volatile solvent and a gel agent that gels the vehicle so that the retro-reflective elements are suspended in the vehicle. The gel agent comprises at least a large proportion of the non-volatile portion of the vehicle.
    Type: Grant
    Filed: August 26, 1977
    Date of Patent: January 26, 1982
    Assignee: Minnesota Mining & Manufacturing Company
    Inventors: John M. Hogseth, Melvin L. Johnson
  • Thermal tumbling granulation
    Patent number: 4310483
    Abstract: A process for producing a granulate of difficultly fusible additives for plastics, particularly of pigments, by thermal tumbling granulation, which process comprises mixing the additive in powder form with a granulating auxiliary which softens between 30.degree. and 200.degree. C. and which has a particle size of 0.1-2.0 mm; and subjecting this mixture to a gentle rotary motion, with heating by means of a source of heat being simultaneously applied at least until softening of the granulating auxiliary commences.
    Type: Grant
    Filed: August 3, 1979
    Date of Patent: January 12, 1982
    Assignee: Ciba-Geigy Corporation
    Inventors: Werner H. Dorfel, Bernhard Medinger, Eduard Troxler
  • Vulcanizable rubber composition
    Patent number: 4310643
    Abstract: A vulcanizable rubber composition composed of 100 parts by weight of a terpolymer rubber (A) composed of 35 to 80 mole % of epichlorohydrin, 15 to 50 mole % of ethylene oxide and 5 to 15 mole % of an unsaturated epoxide, 0.2 to 10 parts by weight of a non-sulfur vulcanizing agent, and 0 to 10 parts by weight of a vulcanization aid. A vulcanized rubber prepared from this composition has superior sour gasoline resistance (softening resistance and resistance to embrittlement) and cold resistance. A rubber mixture (B) of an epichlorohydrin-ethylene oxide copolymer rubber and an epichlorohydrin-unsaturated epoxide copolymer rubber containing 35 to 80 mole % of epichlorohydrin, 15 to 50 mole % of ethylene oxide and 5 to 15 mole % of an unsaturated epoxide may be substituted for the terpolymer rubber (A).
    Type: Grant
    Filed: September 2, 1980
    Date of Patent: January 12, 1982
    Assignee: Nippon Zeon Co., Ltd.
    Inventors: Akio Maeda, Kinro Hashimoto, Masaaki Inagami, Fukushima, Hiroshi
  • Silicone resin coating composition
    Patent number: 4309319
    Abstract: A silicone resin coating composition which, when applied to a solid substrate, provides a thick abrasion resistant coating thereto, is disclosed herein. The coating composition has a basic pH in the range of from 7.1-7.8 and is prepared by hydrolyzing an alkyltrialkoxysilane or aryltrialkoxysilane in an aqueous colloidal silica dispersion. A thickening agent is added to the resultant hydrolysis product.
    Type: Grant
    Filed: October 5, 1979
    Date of Patent: January 5, 1982
    Assignee: General Electric Company
    Inventor: Howard A. Vaughn, Jr.
  • Pigment flushing
    Patent number: 4309320
    Abstract: In the method for transferring an organic pigment from an aqueous pulp to a water-immiscible hydrophobic organic vehicle the improvement to achieve low initial viscosity, good shelf stability, and good tint strength comprising incorporating an additive selected from the class of sulfonated sperm oil, sulfated sperm oil and mixtures thereof with said vehicle and said pigment.
    Type: Grant
    Filed: January 3, 1979
    Date of Patent: January 5, 1982
    Assignee: BASF Wyandotte Corporation
    Inventors: Manohar L. Arora, Thomas E. Foye
  • Flushing process for pigments
    Patent number: 4309223
    Abstract: This invention relates to a method for producing a pigment-organic vehicle product which comprises forcing an aqueous pulp of the pigment through a conduit and injecting the vehicle into the conduit and aqueous pulp. The mixture is then homogenized, subjected to further mixing and transferred to a traveling horizontal perforated surface whereby some of the water drains from the mixture through the perforations. The aqueous pulp, organic vehicle mixture is then forced through a cylindrical chamber having defined therein an axial opening of a diameter smaller than that of the chamber, and at least one second opening spaced from the axial opening. The mixture is forced through the chamber and axial opening by a rotating helical surface whereby the product is extruded through the axial opening and water is squeezed from the mixture. The water then exits from the chamber through the second opening.
    Type: Grant
    Filed: January 3, 1980
    Date of Patent: January 5, 1982
    Assignee: BASF Wyandotte Corporation
    Inventors: Dale L. Rouwhorst, Ronald L. Jillson
  • Tread compositions for tires having low rolling resistance
    Patent number: 4309318
    Abstract: A tread composition for low rolling resistance tires, comprising 100 parts by weight of styrene-butadiene rubber or a styrene-butadiene rubber-based rubber blend and 3.2-5.0 parts by weight of sulphur.
    Type: Grant
    Filed: November 16, 1979
    Date of Patent: January 5, 1982
    Assignee: Yokohama Rubber Co., Ltd.
    Inventors: Asahiro Ahagon, Makoto Misawa, Hiroshi Hirakawa, Kazuo Miyasaka
  • Renatured chitosan and process of making same
    Patent number: 4309534
    Abstract: Renatured chitosan having an optical rotation in solution that is at least 20% more negative than that of untreated chitosan and the process of making same. The process for preparing such renatured chitosan is accomplished by aging a solution of chitosan in an aqueous acid at a pH of about 2.0 to 5.5. It is preferred to age the solution at room temperature for about 2 to 14 days until the optical activity shifts toward the negative by at least about 20%.
    Type: Grant
    Filed: February 15, 1979
    Date of Patent: January 5, 1982
    Assignee: University of Delaware
    Inventor: Paul R. Austin
  • Inorganic adhesive for assembling metallic components
    Patent number: 4309220
    Abstract: Adhesive composition which can be transformed into a metallo-ceramic cement by heat treatment. The binder for the composition is incorporated in the binder which sodium disilicate and the powdered metallic filler is composed of a mixture of aluminium-coated stainless steel powder and ultrafine chromium powder.
    Type: Grant
    Filed: January 16, 1980
    Date of Patent: January 5, 1982
    Assignee: Office National d'Etudes et de Recherche Aerospatiales
    Inventors: Andre R. Hivert, Philippe M. Galmiche
  • Foundry sand mixes with improved bench life for curing with sulfur dioxide or other oxidizable gaseous catalysts
    Patent number: 4308191
    Abstract: Foundry sand mixes comprising a mixture of sand, binder, and hydrogen peroxide are improved with respect to bench life by the addition thereto, at the time of initial preparation of the mixture, of non-catalyzing amounts, but stabilizing amounts, of certain iron chelating agents which are acid or salts of acids selected from those which, in their free acid form, have an acidic pH less than 3.0 when dissolved at 1 percent weight per weight in water or when saturated in water, whichever is lower in concentration.
    Type: Grant
    Filed: February 25, 1980
    Date of Patent: December 29, 1981
    Assignee: The Quaker Oats Company
    Inventors: Robert H. Fox, Roger H. Kottke, James E. Menting, R. Bruce Sampsell
  • Silicone resin coating composition
    Patent number: 4308315
    Abstract: An improved silicone resin coating composition is provided, the composition comprising a dispersion of colloidal silica in an aliphatic alcohol-water solution of the partial condensate of a silanol with a small amount of a polysiloxane polyether copolymer added thereto.
    Type: Grant
    Filed: February 12, 1980
    Date of Patent: December 29, 1981
    Assignee: General Electric Company
    Inventor: Robert B. Frye
  • Dental cavity varnish composition
    Patent number: 4308062
    Abstract: Dental cavity varnish compositions comprising a solution of nitrocellulose and toluene sulfonamide which wet and precisely conform to each "peak" and "valley" of the extensive microundercuts generated during cavity preparation. The varnish compositions are compatible with composite resin restorative materials.
    Type: Grant
    Filed: April 14, 1980
    Date of Patent: December 29, 1981
    Assignee: Pennwalt Corporation
    Inventors: Peter P. L. Cheung, Barry V. Evangelist
  • One-coat adhesive systems
    Patent number: 4308071
    Abstract: Compositions comprising at least one isocyanate-functional organosilane, preferably in combination with at least one polyisocyanate, and, optimally, at least one aromatic nitroso compound having been found to be unexpectedly effective as storage-stable, single-package, one-coat adhesive systems for bonding a variety of elastomeric materials to themselves and other solid substrates, such as metal, fabric, ceramic, and the like substrates. The use of aromatic nitroso compounds is necessary with certain isocyanatosilanes and optional with others, but, in all cases, affords improved performance, especially with respect to environmental resistance.
    Type: Grant
    Filed: August 8, 1979
    Date of Patent: December 29, 1981
    Assignee: Lord Corporation
    Inventor: Nicholas J. Gervase
  • Sulfonated lignin dispersants and dyestuffs
    Patent number: 4308203
    Abstract: Dispersants, especially well suited for use with insoluble dyes, are produced by reacting hydroxyl benzyl alcohol compounds with sulfonated lignin derivatives. The dispersants have high levels of heat stability, coupled with desirable dye reduction, staining, foaming, milling and viscosity-reducing properties. Dyestuffs, dye pastes and dye baths, as well as methods utilizing them, are provided.
    Type: Grant
    Filed: February 22, 1980
    Date of Patent: December 29, 1981
    Assignee: American Can Company
    Inventor: Stephen Y. Lin
  • Cores for tennis balls
    Patent number: 4306719
    Abstract: A core for a tennis-ball, the tennis-ball having either an internal pressure substantially equal to atmospheric pressure (a "pressureless" ball) or an internal pressure of up to 7 p.s.i. (0.49 Kg.cm.sup.-2) above atmospheric pressure (a "low-pressure" ball), in which the core is made from a rubber composition wherein up to 60% by weight of the total polymer content comprises either a copolymer of ethylene and propylene (an EPM elastomer) or a terpolymer of ethylene, propylene and up to 12% by weight of a non-conjugated diene monomer (an EPDM elastomer). The most suitable EPM and EPDM elastomers are those containing 70 mole percent or more ethylene.
    Type: Grant
    Filed: November 16, 1979
    Date of Patent: December 22, 1981
    Assignee: Dunlop Limited
    Inventors: Robert C. Haines, John G. Schofield
  • Anti-sticking composition for coating unvulcanized rubber
    Patent number: 4306994
    Abstract: A dry composition is described which can be converted to an anti-sticking composition for unvulcanized rubber by dispersion in water, consisting essentially of a film forming clay (bentonite or attapulgite), a surfactant and an additive capable of inactivating calcium and magnesium ions (e.g. polyphosphate); optionally, there may be present a defoamer, and up to equal parts by volume, based on a film forming clay, of a filler to speed drying.
    Type: Grant
    Filed: March 27, 1980
    Date of Patent: December 22, 1981
    Assignee: Kalcor Coatings Company, Incorporated
    Inventor: William M. Ellslager
  • Pigment compositions
    Patent number: 4304711
    Abstract: A colored synthetic plastics mass having incorporated therein the calcium salt of the dyestuff from diazotized 2-nitroaniline-4-sulphonic acid and acetoacet-o-chloroanilide.
    Type: Grant
    Filed: March 16, 1979
    Date of Patent: December 8, 1981
    Assignee: Ciba-Geigy Corporation
    Inventor: Derek S. H. Smith
  • Thickeners for acid cleaning compositions
    Patent number: 4302253
    Abstract: This invention relates to storage stable liquid cleaning compositions for use on porcelain type surfaces wherein said compositions comprise an aqueous mineral acid solution thickened with smectite clay and xanthan gum, a stabilizing amount of 1-hydroxyethyl-2-alkylimidazoline and optionally, a chelate. The compositions may further contain a disinfectant.
    Type: Grant
    Filed: February 19, 1980
    Date of Patent: November 24, 1981
    Assignee: R. T. Vanderbilt Company, Inc.
    Inventor: Peter A. Ciullo