Patents by Inventor Robin A. Carden

Robin A. Carden 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: 5895696
    Abstract: A rigid disk substrate for a magnetic recording disk is formed of a metal-clad ceramic-metal matrix composite sandwich structure. The ceramic-metal matrix composite has a composition ranging from approximately 1 to 40 weight % of ceramic and 60 to 99 weight % of metal matrix. The metal matrix material and the metal cladding material are aluminum or an aluminum alloy. The substrate has a thickness less than 1 mm.
    Type: Grant
    Filed: January 30, 1997
    Date of Patent: April 20, 1999
    Assignee: Alyn Corporation
    Inventors: Raymond L. Stanish, William C. Harrigan, Robin A. Carden
  • Patent number: 5865238
    Abstract: A Billet formed of an aluminum alloy matrix and ceramic particles is heated in an oxygen-containing atmosphere, forming an aluminum oxide surface and softening the matrix alloy. The semi-solid billet then is compressed in a die casting sleeve and the softened matrix material is displaced into a die to form the shape.
    Type: Grant
    Filed: April 1, 1997
    Date of Patent: February 2, 1999
    Assignee: Alyn Corporation
    Inventors: Robin A. Carden, Thomas Flessner
  • Patent number: 5803151
    Abstract: An improved soluble core for die casting metals or metal matrix composites is formed of a mixture of salt and up to about 20 weight % of ceramic material blended together to produce a homogeneous mixture and compacted under pressure to produce a soluble core having little or no porosity. The ceramic material can be in the form of fibers, particulates, whiskers, and/or platelets, and has a melting temperature greater than that of the salt. The core can include a thermally insulating outer ceramic coating to enable the core to withstand higher die casting temperatures than conventional salt cores. The improved soluble core is removable with hot water and/or steam and the core material can be reclaimed for reuse. The process is used to form hollow articles.
    Type: Grant
    Filed: April 4, 1997
    Date of Patent: September 8, 1998
    Assignee: Alyn Corporation
    Inventor: Robin A. Carden
  • Patent number: 5722033
    Abstract: A method of extruding a boron carbide-aluminum alloy metal matrix composite includes heating the ingots of the composite to temperatures of about 570.degree. C., holding the ingots at about 570.degree. C. to soften the ingots, placing the ingots in a heated extrusion chamber, and extruding the softened ingots at pressures about 15% to 20% higher than typical pressures used to extrude aluminum alloys. A method of casting a boron carbide-aluminum alloy metal matrix composite includes heating ingots of the composite to about 700.degree. C. to melt the ingots, gently stirring the melt, removing dross from the melt, vigorously stirring the melt with an impeller without creating a vortex, degassing the melt with an argon diffuser wand, and continuously removing froth formed during degassing until the rate of froth formation is reduced and the melt gently bubbles.
    Type: Grant
    Filed: July 1, 1996
    Date of Patent: February 24, 1998
    Assignee: Alyn Corporation
    Inventor: Robin A. Carden
  • Patent number: 5712014
    Abstract: A rigid disk substrate for a magnetic recording disk is formed of a boron carbide-metal matrix composite having a density ranging from 2.5 to 2.8 g/cm.sup.3 and a composition ranging from approximately 1 to 40 weight % of boron carbide and 60 to 99 weight % of metal matrix. The substrate has a thickness less than 1 mm and exhibits negligible resonance characteristics at rotation speeds ranging from 0 through 12,000 rpm. The metal matrix is aluminum or an aluminum alloy. The boron carbide includes metal elements added to improve the chelating properties of the metal matrix material by forming intermetallic bonds with the metal matrix material.
    Type: Grant
    Filed: July 1, 1996
    Date of Patent: January 27, 1998
    Assignee: Alyn Corporation
    Inventor: Robin A. Carden
  • Patent number: 5700962
    Abstract: A neutron shield is formed of a boron carbide-metal matrix composite having a density ranging from 2.5 to 2.8 g/cm.sup.3 and a composition ranging from approximately 10 to 60 weight % of boron carbide and 40 to 90 weight % of metal matrix. The metal matrix is aluminum, magnesium, titanium, or gadolinium or one of their alloys. The boron carbide includes one or more metal elements added to improve the chelating properties of the metal matrix material by forming intermetallic bonds with the metal matrix material. The metal additives are present in the composite in an amount less than approximately 6% by weight. The shield may be in container or plate form.
    Type: Grant
    Filed: July 1, 1996
    Date of Patent: December 23, 1997
    Assignee: Alyn Corporation
    Inventor: Robin A. Carden
  • Patent number: 5669059
    Abstract: An improved metal matrix composite which, in a preferred embodiment disclosed herein, utilizes boron carbide as the ceramic additive to a base material metal. The metal matrix composite of the present invention begins with the preparation of the boron carbide powder by particle size selection in a jet mill. The resulting powder and metal powder are then mixed by blending of powder of all the various elements such as by means of a conventional blender to uniformly mix powdered substances and avoid stratification and settling. After the particles have been sufficiently mixed, they are degassed and then placed into a die and then into a cylindrical container where the particulates are subjected to extremely high pressures transforming the elements into a solid ingot. It is from these ingots that the extrusion tubes or other articles of manufacture may then be made.
    Type: Grant
    Filed: September 29, 1995
    Date of Patent: September 16, 1997
    Assignee: Alyn Corporation
    Inventor: Robin A. Carden
  • Patent number: 5613189
    Abstract: An improved metal matrix composite which, in a preferred embodiment disclosed herein, utilizes boron carbide as the ceramic additive to a base material metal. The metal matrix composite of the present invention begins with the preparation of the boron carbide powder by particle size selection in a jet mill. The resulting powder and metal powder are then mixed by blending of powder of all the various elements such as by means of a conventional blender to uniformly mix powdered substances and avoid stratification and settling. After the particles have been sufficiently mixed, they are degassed and then placed into a die and then into a cylindrical container where the particulates are subjected to extremely high pressures transforming the elements into a solid ingot.
    Type: Grant
    Filed: September 29, 1995
    Date of Patent: March 18, 1997
    Assignee: Alyn Corporation
    Inventor: Robin A. Carden
  • Patent number: 5486223
    Abstract: An improved metal matrix composite which, in a preferred embodiment disclosed herein, utilizes boron carbide as the ceramic additive to a base material metal. The metal matrix composite of the present invention begins with the preparation of the boron carbide powder by particle size selection in a jet mill. The resulting powder and metal powder are then mixed by blending of powder of all the various elements such as by means of a conventional blender to uniformly mix powdered substances and avoid stratification and settling. After the particles have been sufficiently mixed, they are degassed and then placed into a die and then into a cylindrical container where the particulates are subjected to extremely high pressures transforming the elements into a solid ingot. It is from these ingots that the extrusion tubes or other articles of manufacture may then be made.
    Type: Grant
    Filed: January 19, 1994
    Date of Patent: January 23, 1996
    Assignee: Alyn Corporation
    Inventor: Robin A. Carden
  • Patent number: 5340107
    Abstract: A golf club putter head made of a wear resistant and highly polished, aesthetically pleasing silicon nitride material in a manufacturing process which obviates labor intensive machining and finishing. Except for the optional addition of high density material weights at the toe and heel portions of the putter head, the present invention provides a putter head which is made of a monolithic silicon nitride ceramic which has a relatively low density of 3.3 grams per cubic centimeter and which is provided with a polished surface appearance along most of its surfaces. The present invention is preferably fabricated using a process of which the most important step is a high pressure, dry pressing step in which the unique shape of the golf club head described herein facilitates bi-axial symmetric pressure application resulting in what is known as a green part.
    Type: Grant
    Filed: March 19, 1993
    Date of Patent: August 23, 1994
    Assignee: Ceradyne, Inc.
    Inventors: Robert R. Baker, Robin A. Carden