Patents Represented by Attorney Robert B. Ingraham

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  • Method for the preparation of plastic articles by extrusion and cooling by gas bearing
    Patent number: 3976733
    Abstract: Thin plastic tubes are prepared by extruding a heat plastified tube, stretching the tube over a gas bearing having a diameter greater than the diameter of the extruded tube, cooling the surface of the tube adjacent the gas bearing and passing the tube over a cooling mandrel having an outside diameter approximating the diameter of the gas bearing, thereby lowering the temperature of the tube below its heat plastifying temperature.
    Type: Grant
    Filed: June 30, 1974
    Date of Patent: August 24, 1976
    Assignee: The Dow Chemical Company
    Inventor: Carl B. Havens
  • Preparation of curved composite panel containing a rigid foamed plastic
    Patent number: 3976526
    Abstract: A curved panel is prepared by bending a rigid plastic foam such as polystyrene foam and simultaneously applying a rigid facing layer on the convex surface thereof.
    Type: Grant
    Filed: September 16, 1974
    Date of Patent: August 24, 1976
    Assignee: The Dow Chemical Company
    Inventors: William P. Hovey, James J. Kubiak
  • Method and apparatus for testing articles employing a small arms primer
    Patent number: 3972222
    Abstract: A small detonating device such as a rifle, pistol or shotgun primer or percussion cap is employed to provide gas and/or hydraulic pressure for the testing of the relative strength of articles such as plastic containers, sheet, tube and the like.
    Type: Grant
    Filed: September 1, 1972
    Date of Patent: August 3, 1976
    Assignee: The Dow Chemical Company
    Inventors: Edward H. Yonkers, Floyd B. Nagle
  • Thermoplastic molding compositions of rubber-reinforced styrene/maleic anhydride resins and polycarbonate resins
    Patent number: 3966842
    Abstract: Thermoplastic compositions with improved physical properties are obtained by blending from 12 to 40 weight percent of a polycarbonate resin with from about 88 to 60 weight percent of a rubber-reinforced styrene/maleic anhydride copolymer.
    Type: Grant
    Filed: July 18, 1974
    Date of Patent: June 29, 1976
    Assignee: The Dow Chemical Company
    Inventors: Peter J. Ludwig, Arnett L. Bird
  • Extrusion of thermoplastic foam
    Patent number: 3966381
    Abstract: Thermoplastic foam plank is prepared by extrusion from a slotted die between a pair of generally parallel opposed forming plates. A substantial improvement in physical properties is obtained by using curved supports which engage the foaming gel generally adjacent the ends of the die opening and edges of the freshly extruded sheet.
    Type: Grant
    Filed: March 17, 1975
    Date of Patent: June 29, 1976
    Assignee: The Dow Chemical Company
    Inventor: Kyung W. Suh
  • Screen changer
    Patent number: 3962092
    Abstract: A simplified screen changer is provided which is particularly suitable for the extrusion of synthetic resinous thermoplastics. Screens are supported in a recessed movable plate. The screen on the upstream side is sealed against leakage by means of an extrusion pressure actuated sealing ring. The apparatus is of simple and rugged construction.
    Type: Grant
    Filed: January 10, 1975
    Date of Patent: June 8, 1976
    Assignee: The Dow Chemical Company
    Inventor: Ritchey O. Newman, Jr.
  • Bodies of expandable synthetic resins and method of preparation
    Patent number: 3960784
    Abstract: Expandable synthetic resinous bodies which are capable of being expanded to thermal collapse-resistant foams are prepared by impregnating a thermoplastic synthetic resinous body with a blowing or expanding agent and a cross-linking agent. Such impregnation can readily be carried out without the aid of an aqueous suspension.
    Type: Grant
    Filed: November 17, 1971
    Date of Patent: June 1, 1976
    Assignee: The Dow Chemical Company
    Inventor: Louis C. Rubens
  • Method for the preparation of plastic lined pipe
    Patent number: 3959424
    Abstract: Plastic lined pipe and fittings are prepared by forming a liner of a plastic material having a diameter greater than the inside diameter of the pipe or fitting to be lined, reducing the diameter of the liner by hydrostatically swaging the liner and inserting the swaged liner into the pipe or fitting and permitting the plastic memory of the liner to cause expansion and form an interference fit of the liner with the pipe.
    Type: Grant
    Filed: December 7, 1973
    Date of Patent: May 25, 1976
    Assignee: The Dow Chemical Company
    Inventors: David H. Dawson, Douglas S. Chisholm
  • Method and apparatus for the extrusion of foamable thermoplastic materials
    Patent number: 3954929
    Abstract: Plastic foam is extruded into and from a channel where it expands from an extrusion orifice. A pressure controlled gas pocket provides support for the foaming material generally adjacent the extrusion die. The arrangement permits extrusion of foam having widely varying characteristics with a single apparatus.
    Type: Grant
    Filed: April 24, 1975
    Date of Patent: May 4, 1976
    Assignee: The Dow Chemical Company
    Inventor: Guy A. Hoenke
  • Cryogenic construction and article therefor
    Patent number: 3954539
    Abstract: An improved method and article are provided for cryogenic construction and the article is particularly useful when employed with the spiral generation method of applying insulation. An insulating member is provided having a face member having an elongate cross-section and a plurality of backing members also of elongate cross-section adhered to a face of the backing member. Fracturing of the insulation on temperature cycling is substantially reduced.
    Type: Grant
    Filed: September 16, 1974
    Date of Patent: May 4, 1976
    Assignee: The Dow Chemical Company
    Inventor: Hubert Stacy Smith, Jr.
  • Rising-plug plug valve
    Patent number: 3948284
    Abstract: In a rising-plug plug valve wherein the plug and valve body at the narrow end of the plug define a cavity, a passage is provided between the cavity and the outlet opening of the plug valve. On opening, the valve plug and seat portion adjacent the narrowest portion of the plug is flushed by liquid passing therebetween and the outlet opening of the passageway.
    Type: Grant
    Filed: August 19, 1974
    Date of Patent: April 6, 1976
    Assignee: The Dow Chemical Company
    Inventor: Charles Joseph Walworth
  • Insulation of steel tanks
    Patent number: 3948412
    Abstract: Steel tanks are insulated by employing a plurality of material face foam plastic panels. Foam plastic panels have beveled edges and a number of slots formed in the panels. The panels are affixed to the tank by a plurality of studs welded to the tank.
    Type: Grant
    Filed: May 16, 1975
    Date of Patent: April 6, 1976
    Assignee: The Dow Chemical Company
    Inventor: Robert B. Bennett
  • Polymerization of styrene acrylonitrile expandable microspheres
    Patent number: 3945956
    Abstract: Expandable styrene-acrylonitrile microspheres are prepared by polymerizing a mixture of styrene and acrylonitrile with a volatile liquid blowing agent in an encapsulating system to provide expandable microspheres with a styrene-acrylonitrile polymer shell and a single drop of liquid blowing agent encapsulated symmetrically therein. Expandable microspheres of larger size, narrower size distribution and improved expansion characteristics are obtained using an alcohol in the polymerization system.
    Type: Grant
    Filed: June 23, 1975
    Date of Patent: March 23, 1976
    Assignee: The Dow Chemical Company
    Inventor: Joseph L. Garner
  • Cryogenic tank
    Patent number: 3942331
    Abstract: An improved cryogenic tank is provided which has insulation secured to the inner surface of the tank and a relatively thin sealing membrane within the tank to contain cryogenic liquid. Space containing the insulation is maintained at a reduced pressure sufficient to maintain the insulation in engagement with the outer tank wall.
    Type: Grant
    Filed: July 8, 1974
    Date of Patent: March 9, 1976
    Assignee: The Dow Chemical Company
    Inventors: Ritchey O. Newman, Jr., Thomas W. McCullough
  • Tube treating and method
    Patent number: 3939243
    Abstract: Synthetic resinous thermoplastic tubing is reduced radially in diameter with minimal increase in length by passing the tube through a plurality of successively smaller dies wherein a minor portion of the die moves relative to a major portion of the die during the reduction step. Plastic tube is obtained which has a tendency to expand radially with a minimal alteration in its length. Such tubing is particularly suitable for lining of pipe.
    Type: Grant
    Filed: August 19, 1974
    Date of Patent: February 17, 1976
    Assignee: The Dow Chemical Company
    Inventor: David H. Dawson
  • Preparation of dunnage material
    Patent number: 3933959
    Abstract: Generally linear foamable strandular particles which are asymmetrical about a plane generally containing the longitudinal axis provide a desired curled dunnage material when heated to cause foaming. A wide variety of methods may be used to introduce the desired asymmetry.
    Type: Grant
    Filed: September 5, 1972
    Date of Patent: January 20, 1976
    Assignee: The Dow Chemical Company
    Inventors: Richard E. Skochdopole, Keith R. Denslow