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).

  • Publication number: 20130313738
    Abstract: A process for fabricating pre-sintered zirconia blanks that are then computer machined and sintered to form dental appliances having highly advantageous features. The principal steps of a preferred embodiment of that process comprise a) preparing a ceramic slurry of binderless zirconia powder; b) subjecting the slurry to attrition milling down to about a 5-29 nm crystallite size; c) preparing a vacuum assisted and pressure assisted slip casting mold and pouring the milled slurry into the slip-casting mold; d) after casting, excess slurry is poured from the mold and a consolidated zirconia blank is removed; e) drying the blank and pre-sintering it to form solid blanks ready for CAD/CAM machining and sintering to net shape. The attrition is run with ball bearings that are of the sample material to prevent contamination. It also is run, up to 24 hours, to break down the crystallites to overcome the high density of zirconia.
    Type: Application
    Filed: May 26, 2012
    Publication date: November 28, 2013
    Inventor: Robin A. Carden
  • Publication number: 20130316305
    Abstract: Methods and apparatus that permit a dentist to provide a patient with a monolithic ceramic dental restoration (e.g., crown, bridge, or the like) in one office visit. In some embodiments, a dentist is provided with a kit containing one or more near net shape (NNS) millable blanks of various shapes and shades, chair-side software, and a chair-side milling machine to convert a selected millable blank into a finished, fully contoured restoration in about one hour or less. Each such millable blank may be, for example, a dental ceramic (e.g., fully sintered zirconia, fully crystallized lithium silicate, fully crystallized lithium disilicate, or the like) NNS component. In some embodiments, the NNS component includes an integral mandrel at a precise location and orientation to minimize the amount of milling time.
    Type: Application
    Filed: May 23, 2013
    Publication date: November 28, 2013
    Applicant: James R. Glidewell Dental Ceramics, Inc.
    Inventors: Robin A. Carden, Michael J. Selberis
  • Publication number: 20130316306
    Abstract: A method and apparatus that permits a dentist to provide a patient with a monolithic zirconia restoration (i.e., crown) in one office visit. The dentist is provided with a kit of various near net shape (NNS) components of various shapes and shades, chair-side software, and a chair-side milling machine to convert a selected kit component into a finished, fully contoured restoration in about one hour or less. Each such kit component may be, for example, a fully sintered zirconia NNS component having an integral mandrel at a precise location and orientation to minimize the amount of milling time.
    Type: Application
    Filed: May 26, 2012
    Publication date: November 28, 2013
    Inventors: Robin A. Carden, Michael J. Selberis
  • Publication number: 20130231239
    Abstract: Coloring in a slip casting process by which a ceramic slurry is cast into green state bodies. It is during this slip casting that a coloring solution consisting of metallic salts is introduced to the slurry and subsequently slip-cast. A coloring solution may comprise for example a metallic salt, a solvent, an organic solvent such as derivatives of propylene oxides, and an acid can be introduced to the slip casting process. Such a coloring solution can be added to the slip casting process. The solution is thoroughly mixed with the ceramic slurry, after which the ceramic body is cast, dried and finally subjected to a sintering process. After final sinter, the resulting ceramic body possesses an innate color that is homogenous throughout its composition. The method is especially useful for coloring zirconia dental restorations.
    Type: Application
    Filed: March 1, 2012
    Publication date: September 5, 2013
    Inventors: Robin A. Carden, Thomas C. Valenti, Frank A. Jimenez
  • Patent number: 8298329
    Abstract: Unlike conventional dental ceramic powder made by grinding, dental ceramic nanocrystals are formed by vaporization into individual particles. Tetragonal zirconia particles thus formed are not broken into pieces, and so do not transform to weaker monoclinic zirconia and weaker sintered products. The particles created by this approach can be much smaller, and dental prostheses sintered from this powder can be stronger and more realistic. For instance, the smaller size of sintered tetragonal zirconia crystals increases optical translucence by reducing scattering from birefringence, and the small average particle size and tight distribution of sizes and shapes can essentially eliminate pores in a sintered product. Cylindrical and spherical particles can be manufactured by this approach, whereas prior art dental ceramic particles were generally neither.
    Type: Grant
    Filed: April 29, 2010
    Date of Patent: October 30, 2012
    Assignee: James R. Glidewell Dental Ceramics, Inc.
    Inventors: Kenneth E. Knapp, Steven M. Maginnis, Wolfgang Friebauer, Robin A. Carden
  • Publication number: 20120267830
    Abstract: Rapid sintering techniques for densifying zirconium dioxide based ceramic materials employing electromagnetic induction heating or inductive coupled plasma, reducing processing time from hours to minutes. In one embodiment a water-cooled coil is connected to a radio frequency power supply. The coil surrounds a susceptor body which in turn surrounds the ceramic to be sintered. The susceptor heats up in response to a magnetic field emanating from the coil as the coil receives electric power. The heat in turn is radiated from the susceptor and heats the ceramic. In another embodiment, the coil is connected to a radio frequency power supply of sufficiently high frequency and power to establish a plasma in the gas which surrounds the ceramic. The plasma then heats the ceramic. The method is especially useful for sintering ceramic dental appliances, in minutes which can lead to in situ fabrication of such appliances while a dental patient waits.
    Type: Application
    Filed: October 12, 2011
    Publication date: October 25, 2012
    Inventors: Stephen Maginnis, Robin A. Carden, Adam Szeremeta, George Paskalov
  • Publication number: 20120156650
    Abstract: A process to make/seat a permanent crown in only one patient visit, without the need for a temporary crown, after a digital scan or other impression has been taken prior during a dental cleaning appointment or status check up. The dental information is filed and can be used whenever the patient needs a dental restoration to be made. The impression information will have previously been forwarded to a dental laboratory where a shell-crown can be made that is a perfect match to the outer contour of the existing tooth. Needed improvements/corrections can be made with the use of digital software. Also the margins can be determined and corrected, even in the inter-proximal spaces. Now the laboratory is able to manufacture and provide a finished shell-crown in time for the following doctor appointment of this patient.
    Type: Application
    Filed: December 8, 2011
    Publication date: June 21, 2012
    Inventors: James R. Glidewell, Robin A. Carden, Wolfgang Friebauer
  • Publication number: 20120148988
    Abstract: Dental restorations such as crowns, are made from lithium silicate glass ceramic that is heated and pressed onto a metal substrate, the latter being shaped to an impression or scan of the area of the mouth to receive the restoration. The metal substrate is made from an alloy selected to exhibit a coefficient of thermal expansion which is slightly greater than the CTE of the lithium silicate. In a preferred embodiment, the CTE of the lithium silicate glass ceramic is in the range of 11.5 to 12.5 and the alloy is selected to have a CTE of 12 to 13.5. A palladium tin alloy provides that CTE in the preferred embodiment.
    Type: Application
    Filed: December 8, 2011
    Publication date: June 14, 2012
    Inventors: Rodolfo Castillo, Robin A. Carden, Wolfgang Friebauer
  • Publication number: 20110269618
    Abstract: Unlike conventional dental ceramic powder made by grinding, dental ceramic nanocrystals are formed by vaporization into individual particles. Tetragonal zirconia particles thus formed are not broken into pieces, and so do not transform to weaker monoclinic zirconia and weaker sintered products. The particles created by this approach can be much smaller, and dental prostheses sintered from this powder can be stronger and more realistic. For instance, the smaller size of sintered tetragonal zirconia crystals increases optical translucence by reducing scattering from birefringence, and the small average particle size and tight distribution of sizes and shapes can essentially eliminate pores in a sintered product. Cylindrical and spherical particles can be manufactured by this approach, whereas prior art dental ceramic particles were generally neither.
    Type: Application
    Filed: April 29, 2010
    Publication date: November 3, 2011
    Inventors: Kenneth E. Knapp, Steven M. Maginnis, Wolfgang Friebauer, Robin A. Carden
  • Patent number: 7186288
    Abstract: A method of production of large Ingots of neutron attenuating composites using a vacuum-bellows system allows for large cross-sectional shapes to be extruded and rolled. This method uses a vacuum-bellows technology which allows the manufacturing of large 8–16 inch diameter ingots (50–450 lbs. each). A variety of primary metal matrix materials can be used in this technology. High specific strength and stiffness can be achieved because the technology allows for final densities of 99% and higher. The vacuum-bellows technology allows metals and ceramics to blend and mesh together at compression pressures of 800 tons with elevated temperatures. The controlled compression movement allows for any oxide layer, on the metal, to be broken up and consolidated with the chosen ceramic particulate.
    Type: Grant
    Filed: October 8, 2004
    Date of Patent: March 6, 2007
    Inventor: Robin A. Carden
  • Patent number: 7108830
    Abstract: A method of production of large Ingots of neutron attenuating composites using a vacuum-bellows system allows for large cross-sectional shapes to be extruded and rolled. This method uses a vacuum-bellows technology which allows the manufacturing of large 8–16 inch diameter ingots (50–450 lbs. each). A variety of primary metal matrix materials can be used in this technology. High specific strength and stiffness can be achieved because the technology allows for final densities of 99% and higher. The vacuum-bellows technology allows metals and ceramics to blend and mesh together at compression pressures of 800 tons with elevated temperatures. The controlled compression movement allows for any oxide layer, on the metal, to be broken up and consolidated with the chosen ceramic particulate. One application is to blend boron-rich ceramics and high purity (99.5–99.99%) aluminum particulates together and produce a large ingot using this vacuum-bellows technology.
    Type: Grant
    Filed: September 9, 2002
    Date of Patent: September 19, 2006
    Assignee: Talon Composites
    Inventor: Robin A. Carden
  • Publication number: 20050153007
    Abstract: A method of production of large Ingots of neutron attenuating composites using a vacuum-bellows system allows for large cross-sectional shapes to be extruded and rolled. A vacuum-bellows technology which allows the manufacturing of large diameter ingots. A variety of primary metal matrix materials can be used in this technology. High specific strength and stiffness can be achieved because the technology allows for final densities of 99% and higher. The vacuum-bellows technology allows metals and ceramics to blend and mesh together at compression pressures of 800 tons with elevated temperatures. The controlled compression movement allows for any oxide layer, on the metal, to be broken up and consolidated with the chosen ceramic particulate. By controlling the amount of boron-rich ceramics, by volume or weight, certain B-10 isotope areal densities can be accomplished. These B-10 isotopes attenuate neutrons in nuclear fuel. Other elements, which have high, cross-sectional Barn values can be used.
    Type: Application
    Filed: October 8, 2004
    Publication date: July 14, 2005
    Inventor: Robin Carden
  • Publication number: 20050115359
    Abstract: A method of production of large Ingots of neutron attenuating composites using a vacuum-bellows system allows for large cross-sectional shapes to be extruded and rolled. A vacuum-bellows technology which allows the manufacturing of large diameter ingots. A variety of primary metal matrix materials can be used in this technology. High specific strength and stiffness can be achieved because the technology allows for final densities of 99% and higher. The vacuum-bellows technology allows metals and ceramics to blend and mesh together at compression pressures of 800 tons with elevated temperatures. The controlled compression movement allows for any oxide layer, on the metal, to be broken up and consolidated with the chosen ceramic particulate. By controlling the amount of boron-rich ceramics, by volume or weight, certain B-10 isotope areal densities can be accomplished. These B-10 isotopes attenuate neutrons in nuclear fuel. Other elements, which have high, cross-sectional Barn values can be used.
    Type: Application
    Filed: October 8, 2004
    Publication date: June 2, 2005
    Inventor: Robin Carden
  • Patent number: 6884181
    Abstract: A golf ball construction (2) is provided having a solid core composition of a rubber having between 3 to 25 percent by weight of an additive selected from the group of boron carbide, silicon carbide, and/or other advanced ceramic materials, the additives providing an improved core composition. The golf ball (2) further has an improved dimple arrangement in which each dimple (20) defines a dimple edge (24) adjacent a land area (22) of the golf ball, the dimple edge having a radius between 0.050 inches to 0.250 inches. The cover (6) of the ball additionally provides a surface marking opposite a balance point of the golf ball. The balance point of the golf ball being determined by floating the golf ball and allowing the ball to assume a resting configuration within the floating solution.
    Type: Grant
    Filed: November 9, 2000
    Date of Patent: April 26, 2005
    Assignee: Talon Sports
    Inventors: Lauro C. Cadorniga, Mitchell Godfrey, Robin Carden
  • Publication number: 20040060390
    Abstract: A method of production of large Ingots of neutron attenuating composites using a vacuum-bellows system allows for large cross-sectional shapes to be extruded and rolled. This method uses a vacuum-bellows technology which allows the manufacturing of large 8-16 inch diameter ingots (50-450 lbs. each). A variety of primary metal matrix materials can be used in this technology. High specific strength and stiffness can be achieved because the technology allows for final densities of 99% and higher. The vacuum-bellows technology allows metals and ceramics to blend and mesh together at compression pressures of 800 tons with elevated temperatures. The controlled compression movement allows for any oxide layer, on the metal, to be broken up and consolidated with the chosen ceramic particulate. One application is to blend boron-rich ceramics and high purity (99.5-99.99%) aluminum particulates together and produce a large ingot using this vacuum-bellows technology.
    Type: Application
    Filed: September 9, 2002
    Publication date: April 1, 2004
    Inventor: Robin A. Carden
  • Patent number: 6284014
    Abstract: An extrudable and weldable matrix alloy composite comprising: a) a base material metal of about 50 to 99.9% by weight, b) boron carbide or silicon carbide of about 0.1 to 50% by weight, c) less than about 3.0% by weight of at least one metal having an intermetallic phase temperature lower than the melting point of the base material metal, and d) a reinforcement agent of up to about 5% by weight.
    Type: Grant
    Filed: November 8, 1999
    Date of Patent: September 4, 2001
    Assignee: Alyn Corporation
    Inventor: Robin Carden
  • Patent number: 6098700
    Abstract: Apparatus for die casting a shape from a metal matrix composite billet composed essentially of a metal alloy matrix and dispersed ceramic particles, comprising heating means to soften the metal alloy; a horizontal plunger to drive and to compress the billet; a die through which the softened metal matrix and ceramic particles are formed into a shape defined by the interior surface of the die; and cooling means to maintain the temperature of the interior surface of the die at a predetermined temperature.
    Type: Grant
    Filed: February 1, 1999
    Date of Patent: August 8, 2000
    Assignee: Alyn Corporation
    Inventors: Robin A. Carden, Thomas Flessner
  • Patent number: 5980602
    Abstract: An improved metal matrix composite utilizes boron carbide as a ceramic additive to a base material metal. The base material metal is aluminum, magnesium, or titanium, or an alloy thereof, provided in powder form with the balance of the material comprising various trace metals such as chromium, copper, iron, magnesium, silicon, titanium, and zinc. The boron carbide powder comprises 10 to 30% by weight of the metal matrix composition. There is at least one other metal additive. The compositions are useful in a variety of applications where lightweight, strength, stiffness, hardness, and low density are desirable. The compositions are extrudable and weldable.
    Type: Grant
    Filed: May 6, 1997
    Date of Patent: November 9, 1999
    Assignee: Alyn Corporation
    Inventor: Robin A. Carden
  • Patent number: 5948495
    Abstract: A rigid disk substrate for a magnetic recording disk is formed of a ceramic-metal matrix composite. The ceramic-metal matrix composite has a composition ranging from approximately 1 to 40 weight % of ceramic material and 60 to 99 weight % of aluminum or aluminum alloy metal matrix. The ceramic material may be silicon carbide, aluminum oxide, boron carbide, magnesium oxide, silicon oxide, silicon nitride, zirconium oxide, beryllium oxide, titanium boride, titanium carbide, tungsten carbide, or combinations thereof.
    Type: Grant
    Filed: February 4, 1997
    Date of Patent: September 7, 1999
    Assignee: Alyn Corporation
    Inventors: Raymond L. Stanish, William C. Harrigan, Robin A. Carden
  • Patent number: 5921312
    Abstract: An improved soluble core for die casting metals or metal matrix composites is formed of a mixture of salt and about more than 0 weight % and less than 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.
    Type: Grant
    Filed: September 18, 1997
    Date of Patent: July 13, 1999
    Assignee: Alyn Corporation
    Inventor: Robin A. Carden