Patents by Inventor Granville J. Hahn

Granville J. Hahn has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5045252
    Abstract: Method and apparatus for automatically controlling the operation of a rotary extruder, including using a pressure transducer (38, 40, 42) communicating with the annular space (50) between the barrel (12) and rotor (14) to monitor the hydraulic pressure of the melted polymer, using a microprocessor-based controller (62) to compare the measured pressure with a predetermined set point, and thereafter selectively controlling the speed of a feed drive motor (56) or melt drive motor (60) to maintain the melt pressure within a desired range while holding the extruder rotor speed constant.
    Type: Grant
    Filed: October 24, 1989
    Date of Patent: September 3, 1991
    Assignee: Permian Research Corporation
    Inventors: Granville J. Hahn, Allen C. Bailey, Richard D. Antrim
  • Patent number: 5033861
    Abstract: A rotor assembly for use in a rotary extruder, comprising a rotor rotatably mounted inside a barrel by means of drive and free end bearing assemblies; a coaxial longitudinal bore extending into the rotor from its free end; a conduit disposed within the bore defining a longitudinally extending annulus therebetween; and rotatable means providing fluid communication between a heating medium inlet and the rotor bore through the longitudinally extending annulus, and between the annulus and a heating medium outlet through the conduit.
    Type: Grant
    Filed: December 19, 1989
    Date of Patent: July 23, 1991
    Assignee: Permian Research Corp.
    Inventors: Granville J. Hahn, Sammy K. Flud
  • Patent number: 4974336
    Abstract: A method for use in drying particulate matter employing a drier comprising a cylindrical upper section, a frustoconical lower section, a rotatable shaft extending substantially the entire length of the interior of the drier, a plurality of axially spaced arrays of circumferentially spaced, radially extending stirring arms appended to the shaft, and at least two perforated frustoconical separators mounted within the drier in fixed, inverse and spaced apart relation to each other, and means for introducing a heated gas into the drier for contacting and drying the particulate matter, the stirring arms and separators cooperating to retard agglomeration of the particulate matter.
    Type: Grant
    Filed: June 20, 1989
    Date of Patent: December 4, 1990
    Assignee: Permian Research Corporation
    Inventor: Granville J. Hahn
  • Patent number: 4887907
    Abstract: A rotor assembly for use in a rotary extruder, comprising a rotor rotatably mounted inside a barrel by means of drive and free end bearing assemblies; a coaxial longitudinal bore extending into the rotor from its free end; a sleeve within the bore defining a thermally insulated central zone disposed radially inward from the plasticizing surface of the rotor, and cooling zones disposed at each end of the sleeve radially inward from the drive and free end bearing assemblies; a conduit disposed within the sleeve defining a longitudinally extending annulus therebetween; and rotatable means providing fluid communication between a coolant inlet and the interior of the conduit, and between the longitudinally extending annulus and a coolant outlet.
    Type: Grant
    Filed: May 3, 1989
    Date of Patent: December 19, 1989
    Assignee: Permian Research Corporation
    Inventors: Granville J. Hahn, Sammy K. Flud
  • Patent number: 4879138
    Abstract: A moldable and foamable thermoplastic composition comprising a major portion of moldable polypropylene resin; from about 1.25 to about 6 parts per hundred of resin (pphr) foam concentrate; from about 0.15 to about 1 pphr calcium carbonate; from about 0.03 to about 0.15 pphr amorphous silicon dioxide; from about 0.1 to about 0.4 pphr lubricant selected from the group consisting of synthetic waxes and distilled monoglycerides; from about 0.1 to about 0.4 pphr lubricant selected from the group consisting of N,N'-dioleoylethylenediamine and calcium stearoyl-2-lactylate; from about 0.15 to about 0.3 pphr unsaturated fatty monoamide; and from about 0.5 to about 2 pphr titanium dioxide concentrate.
    Type: Grant
    Filed: May 8, 1989
    Date of Patent: November 7, 1989
    Assignee: Permian Research Corporation
    Inventors: Marion Johnson, Granville J. Hahn, Ramiro V. Ramoos
  • Patent number: 4872573
    Abstract: A moldable plastic closure comprising a selectively foamed, unitarily molded layer and at least one layer of barrier resin adapted to retard the migration of oxygen-containing gasses through the closure.
    Type: Grant
    Filed: May 17, 1988
    Date of Patent: October 10, 1989
    Assignee: Permian Research Corporation
    Inventors: Marion Johnson, Granville J. Hahn
  • Patent number: 4866100
    Abstract: A moldable and foamable thermoplastic composition comprising a major portion of moldable polypropylene resin; from about 1.25 to about 6 parts per hundred of resin (pphr) foam concentrate; from about 0.15 to about 1 pphr calcium carbonate; from about 0.03 to about 0.15 pphr amorphous silicon dioxide; from about 0.1 to about 0.4 pphr lubricant selected from the group consisting of synthetic waxes and distilled monoglycerides; from about 0.1 to about 0.4 pphr lubricant selected from the group consisting of N,N'-dioleoylethylenediamine and calcium stearoyl-2-lactylate; from about 0.15 to about 0.3 pphr unsaturated fatty monoamide; and from about 0.5 to about 2 pphr titanium dioxide concentrate.
    Type: Grant
    Filed: May 17, 1988
    Date of Patent: September 12, 1989
    Assignee: Permian Research Corporation
    Inventors: Marion Johnson, Granville J. Hahn, Ramiro V. Ramos
  • Patent number: 4839969
    Abstract: A method, apparatus and system for use in drying particulate matter employing a drier comprising a cylindrical upper section, a frustoconical lower section, a rotatable shaft extending substantially the entire length of the interior of the drier, a plurality of axially spaced arrays of circumferentially spaced, radially extending stirring arms appended to the shaft, and at least two perforated frustoconical separators mounted within the drier in fixed, inverse and spaced apart relation to each other, and means for introducing a heated gas into the drier for contacting and drying the particulate matter, the stirring arms and separators cooperating to retard agglomeration of the particulate matter.
    Type: Grant
    Filed: February 26, 1988
    Date of Patent: June 20, 1989
    Assignee: Permian Research Corporation
    Inventor: Granville J. Hahn
  • Patent number: 4813863
    Abstract: Rotary extruder apparatus is provided comprising housing (22), recess (29) within housing (22), cylindrical rotor (30) rotatably mounted within recess (29) in housing (22), feed inlet (25), discharge outlet (52) providing fluid communication between recess (29) and diehead (26), in combination with gear pump (160) adapted to increase the pressure of material received from discharge outlet (52). Knurled rotor (30), undercut feed inlet (25), segmented rotor shafts (18, 18'), thrust rings (109, 109') made of dissimilar metals, and circumferentially spaced cartridge heaters (63) in housing (22) are also disclosed.
    Type: Grant
    Filed: February 21, 1986
    Date of Patent: March 21, 1989
    Assignee: Permian Research Corporation
    Inventors: Granville J. Hahn, Raleigh N. Rutledge, Durward Rutledge
  • Patent number: 4744478
    Abstract: A molded polymeric container closure comprising at least one substantially unfoamed polymer layer and an integrally molded foamed layer of the same polymer.
    Type: Grant
    Filed: October 23, 1986
    Date of Patent: May 17, 1988
    Assignee: Permian Research Corporation
    Inventor: Granville J. Hahn
  • Patent number: 4713271
    Abstract: Process and apparatus are disclosed for manufacturing foamed articles such as tubes used as pipe insulation, which tubes are of a high impermeability and flexibility and are formed of a polymer, such as polyethylene or polypropylene, containing up to as much as 50% of an elastomer.
    Type: Grant
    Filed: June 24, 1983
    Date of Patent: December 15, 1987
    Assignee: Cosden Technology, Inc.
    Inventors: Alonzo H. Searl, Granville J. Hahn, Raleigh N. Rutledge
  • Patent number: 4621678
    Abstract: Disclosed is heat exchange apparatus for controlling the temperature of a resin after leaving an extruder and prior to extrusion through a die in an extrusion process, comprising a heat exchanger having an inlet and outlet for an extruded heat-plastified resin and an inlet and an outlet for a heat exchange medium to be circulated in heat exchanging relationship with the extruded resin; a selective heater for receiving the heat exchange medium from the heat exchanger, the heater heating the heat exchange medium to a predetermined temperature during a start-up phase of the heat exchange device; a cooler adapted for receiving a portion of the heat exchange medium from the heater, the cooler including an inlet and an outlet for the heat exchange medium and an inlet and an outlet for a cooling medium to be circulated in heat exchanging relationship with the heat exchange medium; control means interposed between the heater and the cooler for selectively directing a portion of the heat exchange medium to said cooler
    Type: Grant
    Filed: March 2, 1984
    Date of Patent: November 11, 1986
    Assignee: Cosden Technology, Inc.
    Inventors: Granville J. Hahn, Raleigh N. Rutledge, Alonzo H. Searl, Walter E. Sommerman
  • Patent number: 4611987
    Abstract: An injector device for use in forming multilayer extrusions of plastic resins and a method for forming such extrusions. The apparatus includes an injector member that divides the extrudate from the first extruder into two layers and receives at least one extrudate from an additional extruder that is interposed by the injector member between the divided layers of the extrudate from the first extruder. The process includes producing plasticized resin by a first extruder, dividing the extrudate into two layers, producing extrudate from a second extruder, and injecting such extrudate between the two layers of the first extrudate.
    Type: Grant
    Filed: July 23, 1984
    Date of Patent: September 16, 1986
    Assignee: Cosden Technology, Inc.
    Inventors: Granville J. Hahn, Raleigh N. Rutledge, Marion Johnson, Jackie D. Murley, Carl Blanchard
  • Patent number: 4552791
    Abstract: A container made of an organic resin having improved vapor barrier characteristics is disclosed which achieves an improved barrier by the placement thereon of a thin coating of an inorganic material.
    Type: Grant
    Filed: December 9, 1983
    Date of Patent: November 12, 1985
    Assignee: Cosden Technology, Inc.
    Inventor: Granville J. Hahn
  • Patent number: 4548570
    Abstract: Apparatus is disclosed for the formation of pipe comprising one or more layers of thermoplastic resin. The apparatus comprises a die housing having a bore therethrough with a mandrel longitudinally supported within the bore by radial members extending from the inside surface of the bore to provide an annular extrusion passageway defined by the inside surface of the housing and the outer surface of the mandrel. The housing includes therein a plurality of electrically resistive heating elements longitudinally positioned parallel to the extrusion passageway to selectively heat the thermoplastic material flowing therethrough in proximity to the heated section thereby increasing the laydown of thermoplastic material. Also included in the housing is plurality of radially adjustable elements having electrically resistive heating elements therein to radially reposition a moveable discharge sleeve held therebetween thereby controlling the wall thickness of the thermoplastic material passing in proximity thereto.
    Type: Grant
    Filed: May 12, 1983
    Date of Patent: October 22, 1985
    Assignee: Cosden Technology, Inc.
    Inventors: Granville J. Hahn, Raleigh N. Rutledge
  • Patent number: 4526736
    Abstract: Process and apparatus are disclosed for manufacturing foamed articles such as tubes used as pipe insulation, which tubes are of a high impermeability and flexibility and are formed of a polymer, such as polyethylene or polypropylene, containing up to about 25% of an elastomer.
    Type: Grant
    Filed: June 30, 1982
    Date of Patent: July 2, 1985
    Assignee: Cosden Technology, Inc.
    Inventors: Alonzo H. Searl, Granville J. Hahn, Raleigh N. Rutledge
  • Patent number: 4512395
    Abstract: Disclosed is a multiple heat exchanger system utilizing an inlet manifold to distribute the flow of thermoplastic material from an extruder to the inlet ends of each of the heat exchangers, and a discharge manifold to converge the flow of thermoplastic material from the discharge ends of each of the heat exchangers and to direct the flow to an extrusion die. The inlet and outlet manifolds include a main port in communication with a plurality of passageways within the manifold to allow flow between a main conduit in communication with the main port and a plurality of distribution conduits in communication with each of the heat exchangers. A flow control means positioned at each distribution port includes a sleeve, having a flow space therethrough, axially aligned within both the distribution port and distribution conduit. The distribution conduit includes a plurality of orifices about the circumference thereof in communication with the heat exchanger for the flow of thermoplastic material.
    Type: Grant
    Filed: October 3, 1983
    Date of Patent: April 23, 1985
    Assignee: Cosden Technology, Inc.
    Inventors: Granville J. Hahn, Raleigh N. Rutledge
  • Patent number: 4512943
    Abstract: A process is disclosed for the formation of pipe comprising one or more layers of thermoplastic resin whereby an annular stream of thermoplastic material is transported through an annular extrusion passageway. The downstream annular portion of the extrusion passageway has a radially movable outer wall. The outer wall is radially moved by heat expansion of a bolt thereagainst to change the thickness of a particular arcuate section of the stream. The thickness of the particular arcuate section of the stream may be further changed through selectively heating by electrical resistive elements an arcuate section of the extrusion passageway to heat the stream of thermoplastic material transported in proximity thereto.
    Type: Grant
    Filed: May 20, 1983
    Date of Patent: April 23, 1985
    Assignee: Cosden Technology, Inc.
    Inventors: Granville J. Hahn, Raleigh N. Rutledge
  • Patent number: 4507071
    Abstract: An apparatus for the formation of a multiple layered pipe comprising a die housing having a bore therethrough with a mandrel longitudinally supported within the bore by a spider to provide an annular extrusion passageway defined by the inside surface of the housing and the outer surface of the mandrel. The mandrel comprises a series of sequentially positioned annular feed rings for the laydown of thermoplastic material on the inner surface of the main thermoplastic material flowing thereover through the extrusion passageway. The extrusion passageway is constricted downstream of the spider but prior to the annular sequentially positioned feed rings to reunite the thermoplastic material after the flow disruption created by the spider. Also included in the mandrel is a longitudinal passageway in communication with the inlet section of the bore for the transportation of thermoplastic material therethrough to one or more of the annular feed rings.
    Type: Grant
    Filed: May 12, 1983
    Date of Patent: March 26, 1985
    Assignee: Cosden Technology, Inc.
    Inventors: Granville J. Hahn, Raleigh N. Rutledge, Jackie D. Murley
  • Patent number: 4501543
    Abstract: A rotary extruder contains pump rings positioned at opposite ends of the rotor shaft to collect excess thermoplastic melt forced outwardly to the housing ends and to redirect this excess melt to the feed section of the extruder. Redirection of the melt is accomplished by helical grooves located on the inside surfaces of the pump rings having an axial component directed toward the center of the extruder to provide a conduit for the melt. The melt is also directed by a series of angular grooves positioned circumferentially about the rotor opposite the pump rings which rotationally and axially propel the melt as the extruder rotor rotates. The rotor shaft is supported by bearings at opposite ends of the shaft which are offset from the axial center of the bearing housing.
    Type: Grant
    Filed: January 13, 1983
    Date of Patent: February 26, 1985
    Assignee: Cosden Technology, Inc.
    Inventors: Raleigh N. Rutledge, Granville J. Hahn