Patents by Inventor Duane R. Secrist

Duane R. Secrist 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).

  • Method for the manufacture of a sheet of reinforcing fibers and the product obtained thereby
    Publication number: 20020192467
    Abstract: A method is provided for manufacturing a reinforcing sheet containing at least one sheet made of a plurality of high tensile modulus fiber monofilaments (12). The sheet defines a first surface (13) and a second surface (15). A first scrim (18) is bonded to the first surface of the sheet and a second scrim (18′) is bonded to the second surface of the sheet.
    Type: Application
    Filed: June 21, 2002
    Publication date: December 19, 2002
    Inventors: Duane R. Secrist, F. Michael Cretella
  • Process for manufacturing carbon fiber pellets, the high density, streamlined pellets resulting therefrom and process for producing reinforced thermoplastic resins employing the pellets
    Patent number: 5639807
    Abstract: Carbon fiber pellets having improved flow characteristics are prepared by mixing chopped or milled carbon fibers with a solution or suspension of a sizing agent, shaping the agglomerated mixture on a tilted rotating surface to provide dense pellets of streamlined shape and drying the pellets. The carbon fiber pellets are especially suitable for use in the manufacture of reinforced thermoplastic resins.
    Type: Grant
    Filed: August 5, 1994
    Date of Patent: June 17, 1997
    Assignee: Akzo Nobel nv
    Inventors: Duane R. Secrist, William M. Jenkins
  • Anode assembly for molten salt electrolysis
    Patent number: 4626333
    Abstract: An anode assembly for an electrolytic cell for molten electrolysis has a cermet connector with a lower electrical resistivity than the anode threaded into the cermet or ceramic anode in the green or calcined state and then sintered to form an anode assembly having a low joint resistance at the cell operating temperature.
    Type: Grant
    Filed: January 28, 1986
    Date of Patent: December 2, 1986
    Assignee: Great Lakes Carbon Corporation
    Inventors: Duane R. Secrist, James M. Clark, Henry E. Grindstaff
  • Cermet electrode assembly
    Patent number: 4541912
    Abstract: A cermet electrode assembly for use in an electrolytic cell is produced by the process of hot isostatic molding a cermet material onto a metal current member. The electrode assembly has long service life and can be joined to an electrical current source by conventional metal joining techniques.
    Type: Grant
    Filed: December 12, 1983
    Date of Patent: September 17, 1985
    Assignee: Great Lakes Carbon Corporation
    Inventors: Duane R. Secrist, James M. Clark, Thomas E. Landon
  • Bipolar electrode for Hall-Heroult electrolysis
    Patent number: 4529494
    Abstract: A monolithic bipolar electrode for the production of primary aluminum by molten salt electrolysis is composed of a cermet anodic layer 10, a conductive and diffusion-resistant intermediate layer 14, and a refractory hard metal cathodic layer 20, with the edges covered by an electrolyte-resistant coating. The intermediate conductive layer 14 has a coefficient of thermal expansion intermediate to the anodic and cathodic layers.
    Type: Grant
    Filed: May 17, 1984
    Date of Patent: July 16, 1985
    Assignee: Great Lakes Carbon Corporation
    Inventors: Louis A. Joo', Duane R. Secrist, James M. Clark, Kenneth W. Tucker, Jay R. Shaner
  • Anode retraction device for a Hall-Heroult cell equipped with inert anodes
    Patent number: 4500401
    Abstract: A compressed air-powered retractor for an inert anode in a Hall-Heroult cell is actuated after power interruption by a time delayed solenoid actuating a valve controlling the air supply to a cylinder connected to the anode support structure.
    Type: Grant
    Filed: December 27, 1983
    Date of Patent: February 19, 1985
    Assignee: Great Lakes Carbon Corporation
    Inventors: James M. Clark, Duane R. Secrist, Scotty L. Hardin, Stephen C. McEntyre
  • Anode for molten salt electrolysis
    Patent number: 4495049
    Abstract: An electrode for an electrochemical cell comprising a variable cermet composition, the portion in contact with the electrolyte having a relatively high ceramic content for maximum corrosion resistance and the portion attached to the external electrical circuit having a relatively high metal content to facilitate an electrical connection. The electrodes vary in metal content from 5-80 vol. %, preferably 12-50 vol. %, either continuously or in graded steps. Preferred metals are Ni, Cu, Fe, and Cr; and preferred ceramics are ferrites.
    Type: Grant
    Filed: November 21, 1983
    Date of Patent: January 22, 1985
    Assignee: Great Lakes Carbon Corporation
    Inventors: Duane R. Secrist, James M. Clark
  • Monolithic composite electrode for molten salt electrolysis
    Patent number: 4491510
    Abstract: A non-consumable electrode having a substantially flat working surface suitable for use as an anode in molten salt electrolysis, particularly for the production of aluminum in Hall-Heroult reduction cells, is produced by a process wherein at least the portion of a conductive core that is exposed to the electrolyte bath is coated with a composition of higher resistivity than the core composition to provide uniform current density at all regions of the working surface of the anode.
    Type: Grant
    Filed: January 24, 1983
    Date of Patent: January 1, 1985
    Assignee: Great Lakes Carbon Corporation
    Inventors: James M. Clark, Duane R. Secrist
  • Corrosion-resistant ceramic electrode for electrolytic processes
    Patent number: 4484997
    Abstract: A ceramic electrode suitable for use in an electrolytic cell has a conductive ceramic substrate of a base material and at least one additive material having a concentration greater than its solubility limit in the base material, and a coating of the base material on the substrate. The electrode is produced such that the additive material is diffused from the substrate to the coating, but such diffusion is terminated before or upon reaching the solubility limits of the additive material in the coating.
    Type: Grant
    Filed: June 6, 1983
    Date of Patent: November 27, 1984
    Assignee: Great Lakes Carbon Corporation
    Inventors: Duane R. Secrist, James M. Clark
  • Anode for molten salt electrolysis
    Patent number: 4472258
    Abstract: An electrode for an electrochemical cell comprising a variable cermet composition, the portion in contact with the electrolyte having a relatively high ceramic content for maximum corrosion resistance and the portion attached to the external electrical circuit having a relatively high metal content to facilitate an electrical connection. Preferred metals are Ni, Cu, Fe, and Cr; and preferred ceramics are ferrites.
    Type: Grant
    Filed: May 3, 1983
    Date of Patent: September 18, 1984
    Assignee: Great Lakes Carbon Corporation
    Inventors: Duane R. Secrist, James M. Clark
  • Non-consumable electrode for molten salt electrolysis
    Patent number: 4462889
    Abstract: A non-consumable cermet electrode for electrolytic proceses comprises at least about 75 vol. % of a hexagonal ferrite component ceramic composition and no more than about 25 vol. % of a metal component.
    Type: Grant
    Filed: October 11, 1983
    Date of Patent: July 31, 1984
    Assignee: Great Lakes Carbon Corporation
    Inventors: Thomas E. Landon, Duane R. Secrist, James M. Clark
  • Anode assembly for molten salt electrolysis
    Patent number: 4443314
    Abstract: An improved anode assembly for an aluminum electrolysis cell is formed by the process of shaping an anode 10 and a cermet connector 12 from powders, machining said articles, and sintering said articles. The cermet connector mates with the anode via a threaded joint located at its region of high temperature 14 during operation thereof to avoid excessive ohmic losses. Mechanical support can be provided by the threaded joint or through the use of separate mechanical suspension bars 22.
    Type: Grant
    Filed: March 16, 1983
    Date of Patent: April 17, 1984
    Assignee: Great Lakes Carbon Corporation
    Inventors: Duane R. Secrist, James M. Clark, Henry E. Grindstaff
  • Method of manufacturing aluminum in a Hall-Heroult cell
    Patent number: 4430189
    Abstract: Aluminum is manufactured in a Hall-Heroult cell employing a non-consumable anode having a substantially flat working surface produced by a process wherein at least the portion of a conductive core that is exposed to the electrolyte bath is coated with a composition of higher resistivity than the core composition to provide uniform current density at all regions of the working surface of the anode.
    Type: Grant
    Filed: February 4, 1983
    Date of Patent: February 7, 1984
    Assignee: Great Lakes Carbon Corporation
    Inventors: James M. Clark, Duane R. Secrist
  • Method of manufacturing aluminum in a Hall-Heroult cell
    Patent number: 4379033
    Abstract: Aluminum is manufactured in a Hall-Heroult cell employing a non-consumable anode having a substantially flat working surface produced by a process wherein at least the portion of a conductive core that is exposed to the electrolyte bath is coated with a composition of higher resistivity than the core composition to provide uniform current density at all regions of the working surface of the anode.
    Type: Grant
    Filed: March 9, 1981
    Date of Patent: April 5, 1983
    Assignee: Great Lakes Carbon Corporation
    Inventors: James M. Clark, Duane R. Secrist