Patents Represented by Attorney R. B. Ingraham

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  • Panel and method for the preparation thereof
    Patent number: 4311541
    Abstract: Composite foam panels are prepared from expanded thermoplastic particles of low density by generally encapsulating the particles in a phenolic foam matrix and providing a particulate expanded mineral substance such as perlite disposed generally adjacent the major surfaces of the panel.
    Type: Grant
    Filed: December 29, 1980
    Date of Patent: January 19, 1982
    Assignee: The Dow Chemical Co.
    Inventor: Duane A. Fultz
  • Thermoplastic foam and process for the preparation thereof
    Patent number: 4307202
    Abstract: Anhydride-containing thermoplastic polymers are foamed with ammonium carbonate, ammonium bicarbonate and ammonium oxalate to provide foams having good heat distortion characteristics and undesirable organic blowing agents are avoided.
    Type: Grant
    Filed: August 21, 1980
    Date of Patent: December 22, 1981
    Assignee: The Dow Chemical Company
    Inventor: John M. Corbett
  • Thermoplastic foam and process for the preparation thereof
    Patent number: 4306036
    Abstract: Anhydride-containing thermoplastic polymers are foamed with ammonium carbonate, ammonium bicarbonate and ammonium oxalate to provide foams having good heat distortion characteristics and undesirable organic blowing agents are avoided.
    Type: Grant
    Filed: August 21, 1980
    Date of Patent: December 15, 1981
    Assignee: The Dow Chemical Company
    Inventor: John M. Corbett
  • Low pressure high volume filter apparatus
    Patent number: 4303518
    Abstract: Rectangular filter cartridges are locked into a filter by means of a cam. Cartridges are readily replaceable.
    Type: Grant
    Filed: November 25, 1977
    Date of Patent: December 1, 1981
    Assignee: The Dow Chemical Company
    Inventor: Sandor Grosshandler
  • Method and apparatus for use with plastic lined pipe
    Patent number: 4302183
    Abstract: Two generally concentric cups and discoidal baffle are employed to provide a uniform heating of thermoplastic liner of lined pipe prior to flanging.
    Type: Grant
    Filed: May 13, 1980
    Date of Patent: November 24, 1981
    Assignee: The Dow Chemical Company
    Inventor: Richard E. Pero
  • Separation of oil from water
    Patent number: 4302337
    Abstract: Water containing traces of oil is cleaned by passing the oil containing water through a foraminous body, the foraminous body having a coating on the surface thereof of an oil-imbibing, oil-swellable latex polymer in a quantity sufficient to blind the foraminous body when the latex is oil swollen.
    Type: Grant
    Filed: January 10, 1977
    Date of Patent: November 24, 1981
    Assignee: The Dow Chemical Company
    Inventors: Edwin G. Larson, Daniel H. Haigh, Richard H. Hall
  • Method for recovering synthetic resinous latex solids
    Patent number: 4299952
    Abstract: Latex is shear coagulated to form a paste, the paste heated and sheared to form a desired crumb; the crumb is mechanically dewatered and ground to a desired particle size. Relatively low energy consumption is a feature of the process.
    Type: Grant
    Filed: March 24, 1980
    Date of Patent: November 10, 1981
    Assignee: The Dow Chemical Company
    Inventors: Ronald J. Pingel, Geofrey P. Onifer, Thomas L. Spencer
  • Method and apparatus for the preparation of foamed structures
    Patent number: 4298557
    Abstract: In the preparation of polyurethane foam by the provision of foamable urethane composition to a trough and subsequent overflow of the trough to a conveyor belt for final foaming and curing of the urethane composition, improved product is obtained by maintaining temperature uniformity laterally across the trough.
    Type: Grant
    Filed: April 14, 1980
    Date of Patent: November 3, 1981
    Assignee: The Dow Chemical Company
    Inventors: Larry L. Bradford, David R. Jordan, Kenneth W. Williams
  • Vinylidene chloride polymer microgels
    Patent number: 4296013
    Abstract: Discrete, crosslinked vinylidene chloride polymer microgels, having a latex particle size of less than 1 micron and a gel content of about 1 to 99 percent, such microgels being obtained by emulsion polymerizing (a) about 50 to about 95 parts by weight of vinylidene chloride, (b) about 5 to about 50 parts by weight of a copolymerizable ethylenically unsaturated comonomer, and (c) about 0.1 to about 10 parts by weight of a copolymerizable crosslinking polyfunctional comonomer. Such microgels have been found to have wide applicability as additives for synthetic foams and fibers, and for the preparation of improved coatings, films, and redispersible latexes.
    Type: Grant
    Filed: December 13, 1979
    Date of Patent: October 20, 1981
    Assignee: The Dow Chemical Co.
    Inventor: Dale S. Gibbs
  • Method of injection molding thermoplastic resinous products substantially free from sink marks, swirls and related blemishes
    Patent number: 4296055
    Abstract: Injection moldings have excellent surface gloss and freedom from sink marks are obtained using a pressurized mold and molding composition containing a volatile fluid foaming agent, a thermally decomposable foaming agent and a finely divided nucleating agent.
    Type: Grant
    Filed: February 7, 1979
    Date of Patent: October 20, 1981
    Assignee: The Dow Chemical Company
    Inventor: Wilford D. Harris
  • Extruded plastic foam shaping apparatus
    Patent number: 4292019
    Abstract: Forming plates for the extrusion of foam from a slot die are provided which are adjustable in relationship to a generally adjacent die face. A movable plate portion is disposed adjacent the die face. The movable portion has a semi-cylindrical groove disposed therein. A pivoting forming plate having half-round edges has one edge disposed within the movable plate. The opposed half-round edge of the pivoting plate rests in a semi-cylindrical groove within a fixed forming plate. A similar opposed plate arrangement is employed on the opposite side of the die slot.
    Type: Grant
    Filed: January 7, 1980
    Date of Patent: September 29, 1981
    Assignee: The Dow Chemical Company
    Inventors: Robert A. Hay, Oswald Bergman
  • Method for manufacturing an improved plug valve
    Patent number: 4288896
    Abstract: A thermoplastic lined plug valve is prepared using a plug having a nonlocking taper and a stem at the small end of the plug. The plug is seated initially by forcing the plug into the plug cavity, raising the temperature of the plug valve above the service temperature of the valve body lining until the valve body lining conforms to the valve plug. The valve is then cooled to a temperature below the service temperature of the body lining.
    Type: Grant
    Filed: December 17, 1979
    Date of Patent: September 15, 1981
    Assignee: The Dow Chemical Co.
    Inventors: Walter H. West, E. D. Prueter
  • Isostatic molding process and seal
    Patent number: 4285896
    Abstract: In the isostatic molding of linings, an improved flange-to-flange seal is obtained when a generally rectangular ring is employed in a generally rectangular groove.
    Type: Grant
    Filed: June 6, 1977
    Date of Patent: August 25, 1981
    Assignee: The Dow Chemical Company
    Inventors: Arnold B. Miller, Herman F. Casper
  • Efficient handling and charging system for expanded, low-density, loose-fill packaging material(s)
    Patent number: 4284372
    Abstract: A continuous handling and dispensing system for pneumatically conveyable, particulate packaging materials, such as foamed plastic dunnage, involves continuous, air-entrained circulation of the material in an essentially closed loop header installation. The header is most advantageously connected to a plurality of dispensing hoppers. Baffles are employed to deflect gas and material into the hoppers and prevent plugging of the header.
    Type: Grant
    Filed: November 19, 1979
    Date of Patent: August 18, 1981
    Assignee: The Dow Chemical Company
    Inventor: Layle V. Smith
  • Process for the preparation of improved styrene acrylic acid copolymers
    Patent number: 4275182
    Abstract: Styrene-acrylic acid or styrene-methacrylic acid copolymers having improved physical properties are prepared by the solution copolymerization of styrene and acrylic acid and/or methacrylic acid at a temperature between 110.degree. and 150.degree. C. in the presence of certain tertiary butyl peroxides.
    Type: Grant
    Filed: November 17, 1977
    Date of Patent: June 23, 1981
    Assignee: The Dow Chemical Company
    Inventor: Duane B. Priddy
  • Dispersible vinylidene chloride polymer microgel powders as additives for polymers
    Patent number: 4273901
    Abstract: A crosslinked vinylidene chloride polymer microgel powder is recovered from a latex and dispersed with moderate shear in a nonsolvent for vinylidene chloride polymers, such as a polyol used in the preparation of polyurethane materials. A dispersion of the powder and a polyol is eminently suited for use in the preparation of polyurethane foams to impart enhanced flame-retardancy and load-bearing properties thereto.
    Type: Grant
    Filed: November 5, 1979
    Date of Patent: June 16, 1981
    Assignee: The Dow Chemical Company
    Inventors: Dale S. Gibbs, Jack H. Benson, Reet T. Fernandez
  • Method of foaming thermoplastic polymeric materials using tetrazole-containing heterocycles
    Patent number: 4258138
    Abstract: Method of foaming thermoplastic polymeric materials using as blowing agents polycyclic fused ring heterocycles containing the tetrazole moiety.
    Type: Grant
    Filed: October 15, 1979
    Date of Patent: March 24, 1981
    Assignee: The Dow Chemical Company
    Inventor: Thomas C. Britton
  • Vinylidene chloride polymer microgels
    Patent number: 4255306
    Abstract: Discrete, crosslinked vinylidene chloride polymer microgels, having a latex particle size of less than 1 micron and a gel content of about 1 to 99 percent, such microgels being obtained by emulsion polymerizing (a) about 50 to about 95 parts by weight of vinylidene chloride, (b) about 5 to about 50 parts by weight of a copolymerizable ethylenically unsaturated comonomer, and (c) about 0.1 to about 10 parts by weight of a copolymerizable crosslinking polyfunctional comonomer. Such microgels have been found to have wide applicability as additives for synthetic foams and fibers, and for the preparation of improved coatings, films, and redispersible latexes.
    Type: Grant
    Filed: September 15, 1978
    Date of Patent: March 10, 1981
    Assignee: The Dow Chemical Company
    Inventor: Dale S. Gibbs
  • Styrene resin composition
    Patent number: 4254028
    Abstract: Improved mold release is obtained in a styrene polymer by incorporating a mixture of fatty acid and metal fatty acid salt.
    Type: Grant
    Filed: September 10, 1979
    Date of Patent: March 3, 1981
    Assignee: Asahi-Dow Limited
    Inventors: Shohachi Ono, Noriaki Umeda, Hisayoshi Kai, Kenichi Okada
  • Process for the preparation of styrene and acrylonitrile containing polymers
    Patent number: 4243781
    Abstract: A process is disclosed for the preparation of styrene and acrylonitrile containing polymers wherein styrene and acrylonitrile in a predetermined ratio are introduced continuously into a recirculating polymerization zone of generally constant composition wherein a portion of the styrene and acrylonitrile is polymerized, material is removed from the polymerization zone at a rate equal to the addition of styrene and acrylonitrile on removal from the polymerization zone the monomer being separated from the resulting polymer, the improvement being maintaining a level of oxygen in the styrene and acrylonitrile not greater than 20 parts per million by weight based on the weight of the styrene and acrylonitrile. The resultant polymer is generally colorless.
    Type: Grant
    Filed: June 25, 1979
    Date of Patent: January 6, 1981
    Assignee: The Dow Chemical Company
    Inventor: Raymond W. Kent, Jr