Extracting Pattern In Liquid State Patents (Class 164/35)
  • Patent number: 4651798
    Abstract: A molding medium and process for making it, preferably for use in the evaporative pattern casting process, is disclosed. The molding medium comprises, in one embodiment, a base granular molding material having spherically shaped grains wherein the individual grains of the material are coated with a refractory material. Preferably the grains are coated first with a binding agent and then mixed with a refractory material, which may be zirconium oxide. After coating, the material is fired at a high temperature, crushed and screened to size, according to one method. Alternatively, the base molding material may itself be a refractory material, in which case the refractory material is mixed with a binding agent to agglomerate the base material into substantially spherical particles and a refractory coating need not be applied. In either embodiment, substantially spherical free-flowing particles are produced having a low angle of repose.
    Type: Grant
    Filed: September 17, 1984
    Date of Patent: March 24, 1987
    Inventor: Leslie D. Rikker
  • Patent number: 4651799
    Abstract: The mold body contains a cavity and at least one vent passage for venting gas from the cavity through the body. The vent passage has a portion of predetermined regular shape extending part-way through the cavity wall defining at one end an inlet portion opening into a portion of the cavity with a substantially greater resistance than the cavity to penetration therein of casting material. The vent passage further has an outlet portion formed by an irregular crack in the mold body extending from an inner end exposed to the inlet portion through the mold body, the crack having one of its transverse cross-section dimensions short enough to prevent leakage of casting material therethrough. The mold is made by forming a partially bonded ceramic material containing a casting cavity and incorporating in a wall of the cavity a vent pattern of a shape to mold the portion of predetermined regular shape of the vent passage.
    Type: Grant
    Filed: January 30, 1986
    Date of Patent: March 24, 1987
    Assignee: Hitchiner Manufacturing Co., Inc.
    Inventor: George D. Chandley
  • Patent number: 4630825
    Abstract: A hollow metallic head having a ball striking front face and a bottom surface,(b) the head defining an opening between the hollow and the exterior, the opening located at the bottom of the head, the head having a heel and toe,(c) and a closure for that opening having elongated, tongue and groove, linear sliding connection with the head, the closure located at the bottom of the head, the closure directly exposed along its length to the head hollow above the closure,(d) the connection having a substantially T-shaped cross section, the closure being longitudinally elongated in the direction between the hell and toe, and the connection comprising two pairs of tongue and groove elements, each pair including a tongue element on the closure and a groove element on said head to limit inward displacement of the tongue elements, the closure having a lowermost outer surface everywhere spaced from the tongue and groove elements and flush with the head bottom surface at opposite sides of the closure lowermost outer surfac
    Type: Grant
    Filed: December 17, 1984
    Date of Patent: December 23, 1986
    Assignee: Glenn H. Schmidt
    Inventors: Glenn H. Schmidt, Howard F. Schmidt, Glenn R. Seidman
  • Patent number: 4630346
    Abstract: A method of making jewelry or the like to enhance the retention of a gem to a retaining bezel area of the jewelry, comprising the steps of obtaining and utilizing the gem as a model initially, casting the gem in a moldable material, allowing the moldable material to set, dividing the set moldable material into segments to expose the gem, thereby providing a recess in at least two divided moldable material segments thus formed, removing the gem to expose the recesses, casting into the recesses a material which is soluble in the presence of a fluid so that the cast material has an external configuration of the gem when set, allowing the cast material to set, removing the cast material from the recesses of the moldable material, crafting a temperature sensitive substance about the cast material to form the bezel area and attendant jewelry, removing the set soluble material in the presence of the fluid, vaporizing the temperature sensitive substance with molten material using a lost wax process, allowing the molt
    Type: Grant
    Filed: March 20, 1985
    Date of Patent: December 23, 1986
    Inventor: Steven M. Singer
  • Patent number: 4617977
    Abstract: The present invention provides a method for manufacturing a thin-walled ceramic casting mould which is particularly suitable for casting directionally solidified articles in which rapid cooling of the cast material is required. The mould is transfer moulded around a disposable pattern material and includes an integral core. The mould has an outer wall thickness of the order of 0.5 mm to 2.0 mm. The mould and core may be made of the same or different ceramic materials chosen for their strength or thermal conductivity. The method further provides for a series of high temperature disposable supports embedded in the disposable pattern material, providing support for the outer wall of the mould during the firing process. The disposable supports are disposed of at a temperature at which the mould has acquired self-supporting strength.
    Type: Grant
    Filed: June 30, 1983
    Date of Patent: October 21, 1986
    Assignee: Rolls-Royce Limited
    Inventor: David Mills
  • Patent number: 4611371
    Abstract: As a substitute for brazing conventionally employed for attaching curved pad holders to rims of an eyeglass-frame, casting is used for formation of an eyeglass-frame including, in one body with its rims, straight pad holders which should thereafter be bend to a required configuration. Conventional troubles arising from use of brazing are fully removed.
    Type: Grant
    Filed: August 24, 1982
    Date of Patent: September 16, 1986
    Assignee: Nippon Gakki Seizo Kabushiki Kaisha
    Inventors: Yoshihiro Fujino, Kazuo Kurahashi
  • Patent number: 4603726
    Abstract: A method of making individual castings. In the production of individual castings, in particular in dental engineering, the casting is usually premodeled in wax. However, this casting model is very susceptible to deformation, which leads to inaccuracies in the fit of the casting. With the present method, at least a part of the casting model is built up from a photopolymerizable compound which burns leaving no residue. Advantageously, the curing is carried out, in the presence of a suitable initiator, with visible light; the basis of the compound is a photopolymerizable (meth)acrylic acid ester. In dental engineering, with the present method there is made possible in a simple manner to build up form-stable casting models for making crowns, bridges, and inlays and, particularly favorably, complicated secondary parts for removable dental appliances.
    Type: Grant
    Filed: November 4, 1983
    Date of Patent: August 5, 1986
    Assignee: ESPE Fabrik pharmazeutischer Praparate GmbH
    Inventors: Hubert Pfannenstiel, Heinz-Joachim Hubner
  • Patent number: 4603728
    Abstract: The apparatus comprises an expandable investment ring having a removable base. Formed on the top surface of the base, and within the void defined by the ring, is an indexed sprue former. A curved runner bar having an indexed coping is formed at one end thereof in mating relation to the sprue former. The curved full arch runner bar comprises a proximal end portion and distal end portion with the distal end forming a first and second curved configuration portion which together approximates the curved configuration of the jawbone of a patient. The first and second curved configuration portions are interconnected thereby resulting in extremely accurate full arch base metal castings. The apparatus is also useful for preparing precious metal castings.
    Type: Grant
    Filed: April 1, 1985
    Date of Patent: August 5, 1986
    Inventor: Carl H. Rousseau
  • Patent number: 4600546
    Abstract: This invention relates to a process for the production of an implant of metal or plastics material having an open-celled structure as a bone substitute. The process uses a connectively open-celled pattern material having a spatial grid or lattice network structure, the cells or pores of the material being defined or formed by very fine thin interconnected threads or cords. The thin threads are coated by a wax-water emulsion which is combustible and vaporizable. A stabilization of the coating may be performed by spraying-on of a hardening and vaporizable synthetic material lacquer, which is deposited on the wax coating. A core material is introduced into the residual hollow spaces of the pattern, which is consolidated by heat, the pattern material being burnt and vaporized while doing so, together with the adhering material and the lacquer without leaving behind any residues, so that the cavities formed in the core may be filled with the implant material and the core material is finally removed.
    Type: Grant
    Filed: April 9, 1985
    Date of Patent: July 15, 1986
    Assignee: S+G Implants GmbH
    Inventor: Hans Grundei
  • Patent number: 4580613
    Abstract: A mold construction and method for use in producing articles having a predetermined crystalline orientation including single crystals. The technique employs a seed holder or cradle that is inserted into a bottom aperture of a ceramic mold to permit the precise orientation of one or more seeds relative to the article cavity and to provide improved solidification process control. The technique also facilitates pattern assembly and pattern removal operations during fabrication of the ceramic mold.
    Type: Grant
    Filed: August 5, 1982
    Date of Patent: April 8, 1986
    Assignee: Howmet Turbine Components Corporation
    Inventors: Evan R. Miller, Lamar Burd, Eugene J. Carozza, Robert E. Grunstra
  • Patent number: 4577669
    Abstract: The method for transporting wax structure between first and second positions, and including (a) a support relatively movable into adjacency to said structure, (b) prong means associated with said support and movable relative thereto between retracted and advanced positions, the steps that include (i) advancing said prong means in non-parallel direction into said advanced position penetrating said wax structure, and (ii) displacing said support and prong means to transport said wax structure.
    Type: Grant
    Filed: August 1, 1984
    Date of Patent: March 25, 1986
    Assignee: Glenn H. Schmidt
    Inventors: Glenn H. Schmidt, Howard F. Schmidt
  • Patent number: 4574866
    Abstract: In an investment casting method, a wax coating is provided to the exterior and interior surfaces of a thin-walled hollow metallic form. The wax coating on the exterior and interior surfaces is coated with a mold forming material. When the metallic form is heated, the wax will melt permitting removal of the form.
    Type: Grant
    Filed: October 26, 1984
    Date of Patent: March 11, 1986
    Inventor: Leung Tom
  • Patent number: 4561491
    Abstract: A method of manufacturing a mould for use in the investment casting of a hollow gas turbine engine blade in which a ceramic core is coated with a surface modifying material prior to the application of wax thereto to define a pattern of the object to be cast. The surface modifying material adheres to the core and provides a textured surface to which the wax keys, thereby preventing the wax lifting from the core.
    Type: Grant
    Filed: November 14, 1984
    Date of Patent: December 31, 1985
    Assignee: Rolls-Royce Limited
    Inventor: John D. Slack
  • Patent number: 4558841
    Abstract: A spruing assembly for receiving investment material in the production of an investment mold for castings by the "lost wax" process which includes a hollow chamber to receive the investment material formed by a base member and an engaging tapered ring. A horizontal feeder bar is contained within the chamber and is supported by hollow sprue means. The feeder bar is open at its top and has a narrow channel for conducting molten wax into the hollow sprue support. The base member includes a centralized sprue base former and support means associated with the former to provide support for the hollow sprue means supporting the feeder bar.
    Type: Grant
    Filed: February 10, 1984
    Date of Patent: December 17, 1985
    Assignee: Dentifax International Inc.
    Inventors: Melvin A. Engelman, Victor Zamaloff, Curtis L. Engelman
  • Patent number: 4557316
    Abstract: A method for the manufacture of an investment shell mold is disclosed which comprises applying to the surface of a wax pattern at least one layer of slurry formed by dissolving in an organic solvent a soluble organic cellulose derivative containing a dispersed metallic oxide, subsequenty applying to the first layer at least one layer of slurry formed by mixing a refractory powder with a cellulose binder, and thereafter causing the applied slurry layers to set and removing the pattern by the ordinary method.
    Type: Grant
    Filed: June 29, 1984
    Date of Patent: December 10, 1985
    Assignees: Agency of Industrial Science & Technology, Ministry of International Trade & Industry
    Inventors: Takeshi Takayanagi, Shizuo Suzuki, Susumu Minowa, Yoshihiko Nozaki
  • Patent number: 4549597
    Abstract: A method of manufacturing durable metal molds whereby metal melt-spraying is utilized. The method comprises the steps of spraying a first model with a low melting point metal, removing the first model, casting a second low melting point metal into the space vacated by removal of the first model to form a second model, removing the second model, spraying the second model with a high melting point metal, melting said second model out of the mold formed by spraying the high melting point metal, reinforcing the space vacated by the melting of the second model with sand, and reinforcing the space to the rear of the mold with metal, cement, or any suitable material. The sand is subsequently removed to form a durable metal mold.
    Type: Grant
    Filed: September 15, 1983
    Date of Patent: October 29, 1985
    Inventor: Masuzo Hamamura
  • Patent number: 4512383
    Abstract: A vertical pressure die casting apparatus comprising a stationary member, an air-permeable die detachably mounted on the stationary member and formed with a cavity including a downwardly open runner portion and a casting cavity portion communicating with the runner portion, a die clamping member to clamp the die vertically between the stationary member and the die clamping member, a sleeve held in position with respect to the stationary member and having a bore upwardly communicating with the runner portion of the cavity in the die, and a power cylinder provided below the die and having a cylinder body fixedly held in position with respect to the stationary member and a piston rod extending upwardly into the sleeve and vertically slidable in the sleeve.
    Type: Grant
    Filed: December 14, 1982
    Date of Patent: April 23, 1985
    Assignee: Nissan Motor Company, Limited
    Inventors: Shunsuke Suzuki, Masanobu Mori, Takeshi Miyata
  • Patent number: 4508156
    Abstract: A metal charm has the impression of the biting edges of teeth formed in it. It may also be formed in a rubber stamp.
    Type: Grant
    Filed: September 28, 1982
    Date of Patent: April 2, 1985
    Assignee: Vasilia Ltd.
    Inventors: Julia G. Banks, William Ficho
  • Patent number: 4508155
    Abstract: The apparatus comprises an expandable investment ring having a removable base. Formed on the top surface of the base, and within the void defined by the ring, is an indexed sprue former. A curved runner bar having an indexed coping is formed at one end thereof in mating relation to the sprue former. By virtue of this apparatus extremely accurate base metal castings may be obtained. The apparatus is also useful for preparing precious metal castings.
    Type: Grant
    Filed: June 4, 1982
    Date of Patent: April 2, 1985
    Inventor: Carl H. Rousseau
  • Patent number: 4499940
    Abstract: A casting process for making and utilizing an elastomeric pattern that is coated with a non-metallic material to form a non-metallic shell mold and thereafter removed from the non-metallic shell mold by thermal decomposition or mechanical stripping.
    Type: Grant
    Filed: August 1, 1983
    Date of Patent: February 19, 1985
    Assignee: Williams International Corporation
    Inventor: Robert T. Hall
  • Patent number: 4479527
    Abstract: A pad eliminatable by heat prior to casting has a patterned surface and a non-porous backing. The pad is sized and shaped into at least part of the appliance and the patterned surface is conformed to the desired bonding surface contour. The patterned surface yields irregularities in the cast bonding surface which increases bondability.
    Type: Grant
    Filed: November 2, 1982
    Date of Patent: October 30, 1984
    Assignee: Unitek Corporation
    Inventor: Ralph A. Boettcher
  • Patent number: 4472092
    Abstract: The method of fabricating a metal shell golf club head includes forming a core to the form of the inside surface of the shell; forming a plug integral with the core to project outwardly therefrom, the plug formed to outline peripheral shape conforming to the inner peripheral edge of a sole plate opening in the head shell; forming at least one gripper finger opening and at least one locking recess in the side of the plug, the core characterized as being soluble in a fluid solvent; forming a wax shell about the core while locating the plug in fixed position in a mold to hold the core in predetermined position and while maintaining a locking plunger in the formed recess; and removing the core and plug relative to the wax shell by dissolving the core and plug in the solvent; the core being transferred between stations (at which the (a) and (b) steps are carried out) by gripping and bodily displacing the plug which is integral with the core.
    Type: Grant
    Filed: August 9, 1982
    Date of Patent: September 18, 1984
    Inventor: Glenn H. Schmidt
  • Patent number: 4434835
    Abstract: A method of making at least the aerofoil of a blade for a gas turbine engine in which the cooling air exit passages, whether at the trailing edge or in other parts of the aerofoil, are cast rather than machined subsequently. In the method a disposable piece is formed with holes of the shape of the holes eventually required in the blade aerofoil. The piece is placed in a die and used to define part of the ceramic core required in the casting process, the die being arranged to produce a channel portion interconnecting the otherwise free ends of the parts of the core which will form the passages. The ceramic core thus formed in a lost-wax casting process to form the blade aerofoil, the channel portion being embedded in the shell mould to support the parts which define the passages.
    Type: Grant
    Filed: March 9, 1982
    Date of Patent: March 6, 1984
    Assignee: Rolls-Royce Limited
    Inventor: Kenneth Willgoose
  • Patent number: 4421153
    Abstract: A blade or vane structure for a gas turbine engine comprises a hollow aerofoil member and a cooling air entry tube within the hollow aerofoil member, the aerofoil and the tube comprising a unitary cast structure. To make this structure it is proposed that a lost wax casting process should be utilized, with the internal cavities formed using ceramic cores formed with the aid of temporary, disposable pieces which define the space eventually occupied by the tube.
    Type: Grant
    Filed: July 13, 1981
    Date of Patent: December 20, 1983
    Assignee: Rolls-Royce Limited
    Inventors: Wilfred H. Wilkinson, Edwin Pateman, Anthony G. Gale, John Slinger
  • Patent number: 4417381
    Abstract: A method of making a two part aerofoil gas turbine engine blade consisting of casting each individual part separately, the parts being cast by the lost wax process, and subsequently joining the parts together after machining.
    Type: Grant
    Filed: March 8, 1982
    Date of Patent: November 29, 1983
    Assignee: Rolls-Royce Limited
    Inventor: Gordon J. S. Higginbotham
  • Patent number: 4396054
    Abstract: Process for making a multiple unit fixed prosthesis. A conventionally prepared wax bridge is separated into a plurality of segments, a plurality of brace members are partially interconnected between the segments, and an anchoring member having the general configuration of the wax bridge is prepared for attachment to the segmented bridge by first securing a different support member to each pontic and coping of the bridge and by temporarily securing the anchoring member to a preselected one of the pontics or copings. All of the support members are then permanently secured to the anchoring member by an adhesive that does not introduce distortion into the bridge as it hardens.
    Type: Grant
    Filed: February 2, 1981
    Date of Patent: August 2, 1983
    Inventor: Steve Cole
  • Patent number: 4392289
    Abstract: Articles of jewelry with gems set in precious metal are cast by a modified lost wax method whereby each gem is retained in position in the investment mold after removal of the wax enabling the setting of the gem to be simultaneous with the casting of the precious metal. The wax model of the article of jewelry is molded with undercut grooves in the sidewall of the gem seat located to engage portions of the girdle of the gem for retention thereof in set position in the finished article. The wax for the model is formulated to provide resiliency to permit the gem to be snapped into position in the wax model prior to embedding the model with the gem set therein in investment material in the conventional flask. Curing time is reduced to approximately one half the conventional fourteen hours by precise control of predetermined time and temperature which also prevents marring of the gems during the curing of the investment and the casting of the precious metal.
    Type: Grant
    Filed: June 1, 1981
    Date of Patent: July 12, 1983
    Assignee: Charles Hoffert of America, Inc.
    Inventor: Franck Michaud
  • Patent number: 4384607
    Abstract: A method of casting a blade or vane for a gas turbine engine which enables the production of more complex internal shapes than those which may be made by prior art methods. The method of the invention includes the steps of:making a temporary filler piece from a disposable material,holding the filler piece in place in a die,injecting the core material into the die and causing it to solidify round the filler piece,removing the core from the die,causing the filler to be removed from the core to leave within the core a cavity having the shape of the filler, andusing the core thus produced in an investment casting process to form the blade or vane shape.
    Type: Grant
    Filed: July 13, 1978
    Date of Patent: May 24, 1983
    Assignee: Rolls-Royce Limited
    Inventors: Andrew G. B. Wood, Anthony G. Gale
  • Patent number: 4375233
    Abstract: A finished ceramic airfoil is provided having within it a lining of thermal insulation and a fusible core having the desired contour of the metal core of the turbine blade. A casting mold is provided around the airfoil. The fusible core is melted and removed, leaving a cavity in the airfoil surrounded by the insulation lining. The cavity is filled with molten metal which is allowed to solidify to form the metal core of the turbine blade.
    Type: Grant
    Filed: October 21, 1980
    Date of Patent: March 1, 1983
    Inventors: Axel Rossmann, Werner Huther
  • Patent number: 4356859
    Abstract: A wax pattern and runner assembly includes resilient means whereby upon expansion of the wax upon removal from a ceramic mould the resilient means are compressed.
    Type: Grant
    Filed: January 15, 1981
    Date of Patent: November 2, 1982
    Assignee: Rolls-Royce Limited
    Inventor: Philip Savage
  • Patent number: 4347888
    Abstract: A method of making a form of a desired shape, for use in an investment casting technique which comprises forming a first sheet of formable material to a shape which approximates to the desired shape of the form, disposing the formed shape around a layer of deformable hardenable material, applying a compressive force to the formed shape to deform the underlying hardenable material to a desired shape, hardening the hardenable material to produce a form precursor, removing the formed shape from the hardened form precursor and utilizing the hardened form precursor to form a second sheet of formable material into the form of the desired shape. The invention also includes a method of making crowns by an investment casting technique utilizing the form produced by this method.
    Type: Grant
    Filed: March 20, 1980
    Date of Patent: September 7, 1982
    Inventor: Melvyn P. Butler
  • Patent number: 4346750
    Abstract: Disclosed is a prefabricated pontic framework formed of a non-precious material and method to be used in making dental bridges. The prefabricated pontic framework comprises a plurality of pontic supports with a connecting bar mounted on opposed sides of each pontic support, such pontic framework being selected and cut to size for a particular bridgework situation.
    Type: Grant
    Filed: November 5, 1980
    Date of Patent: August 31, 1982
    Inventor: Mike Z. Nemethy
  • Patent number: 4340107
    Abstract: Method and apparatus for producing ceramic shell molds characterized in that a plurality of pattern set-ups are arranged with their longitudinal axes transverse to an axis of rotation and are rotated as a group while applying fluent refractory material to produce either a multiple number of molds or a single mold. A ceramic shell mold characterized by a main sprue passage, a plurality of transverse sprue passages extending therefrom, and casting cavities gated into the transverse passages.
    Type: Grant
    Filed: April 20, 1978
    Date of Patent: July 20, 1982
    Assignee: Precision Metalsmiths, Inc.
    Inventor: Timothy R. Bauer
  • Patent number: 4326326
    Abstract: An integral stainless steel golf club head having a lead insert positioned directly behind the center of the intended striking surface of the club head is provided by using a "lost wax" procedure to mold an internally screwthreaded recess in the rear surface of the club head, into which a correspondingly threaded lead insert of selected weight and length is inserted.
    Type: Grant
    Filed: July 9, 1980
    Date of Patent: April 27, 1982
    Assignee: The Merion Corporation
    Inventor: Paul MacDonald
  • Patent number: 4296793
    Abstract: A refractory suspension comprising (parts by weight): coke, 10-60; powdered metallic titanium or/and zirconium, +0.3-5.0; resol resins, 5-50; a hardener, such as an inorganic acid, 2-30; an organic solvent, 20-60.The proposed suspension allows making foundry moulds exhibiting a higher strength. The castings produced in said foundry moulds are superior in accuracy by 2 classes, according to the USSR classification, to those obtained by the prior-art methods.
    Type: Grant
    Filed: May 10, 1979
    Date of Patent: October 27, 1981
    Inventors: Konstantin K. Yasinsky, Sergei G. Glazunov, Jury N. Ross, Igor D. Bykov
  • Patent number: 4287932
    Abstract: The material used for the production of cores for precision molds is a metal which is oxidizable at relatively low temperatures, i.e., below the solidification temperature of the melts for pouring, and which passes directly from the solid state to the gas state by oxide sublimation. This greatly speeds up the dissolving of cores, particularly small diameter cores, out of the castings.
    Type: Grant
    Filed: August 20, 1980
    Date of Patent: September 8, 1981
    Assignee: Sulzer Brothers Limited
    Inventor: Hans Schneider
  • Patent number: 4283831
    Abstract: A method of casting metal so that the finished casting will hold a precise dimension in certain critical areas in order to enable the finished casting to be used as a frame for objects such as coins and medallions which are die struck to precise dimensions. Means of and apparatus for rigidly maintaining the object inside the cast frame by inexpensive means which will not damage the object and which will allow the object to be easily removed from the frame if necessary.
    Type: Grant
    Filed: May 5, 1980
    Date of Patent: August 18, 1981
    Assignee: Tempo G
    Inventor: Shigeru Jhono
  • Patent number: 4250943
    Abstract: A method of manufacturing a mold adapted to be used for casting bodies of fiber-reinforced composites. A model of the body to be cast is prepared and coated with a one-piece dense shell of refractory metallic oxide deposited by plasma or flame spraying and the model is then separated from the shell by conventional physical or chemical treatment.
    Type: Grant
    Filed: September 21, 1978
    Date of Patent: February 17, 1981
    Assignees: Office National d'Etudes et de Recherches Aerospatiales, Microfusion S.A.
    Inventors: Maurice Rabinovitch, Pierre Magnier
  • Patent number: 4246954
    Abstract: A casting tree for preparing a tandem mold suitable for sequential casting, within the same casting flask, of both white and yellow gold portions of jewelry items has a base with a main stem extending upwardly from the base. In addition, a secondary stem is also provided and extends from the base to an upper portion of the main stem. Both stems are formed of a fusible material generally termed as "casting wax." Disposed through the central portion of the main stem, between the base and the upper portion to which the secondary stem extends, is a piece of non-fusible material, preferable a ceramic disc.When the subject invention tree is used in an investment casting process, the casting mold formed thereby comprises a tandem mold divided by a non-fusible separator, each portion of the mold having a separate passage communicating therewith whereby two different types of material, for example, a white gold and yellow gold, can be separately cast using one flask.
    Type: Grant
    Filed: February 1, 1979
    Date of Patent: January 27, 1981
    Assignee: Wasko Gold Products Corp.
    Inventors: Abraham M. Cohen, Henry L. James
  • Patent number: 4240493
    Abstract: In a shell investment casting process a reusable pouring cup form is used. The shell mold is built up around both the pattern and the pouring cup form. When the pattern wax is removed, the pouring cup form is also removed to leave a formed in situ pouring cup. A significant feature is that the pouring cup has a rolled lip that is relatively strong and does not tend to cast debris into the mold. This lip facilitates handling of the shell mold.
    Type: Grant
    Filed: April 9, 1979
    Date of Patent: December 23, 1980
    Inventor: Russell F. Wilmarth
  • Patent number: 4220190
    Abstract: A method of producing cast metal tooling, especially injection molds or dies, characterized by the steps of making a thin walled, investment cast shell which defines the functional cavity surface of the tooling, and casting a suitable backing metal against the shell to form a composite die or mold structure.
    Type: Grant
    Filed: November 2, 1978
    Date of Patent: September 2, 1980
    Assignee: Precision Metalsmiths, Inc.
    Inventors: Robert A. Horton, John H. Simmons, Timothy R. Bauer
  • Patent number: 4213495
    Abstract: An improved method incorporating investment burn out at a predetermined ideal temperature. The investment encasing the wax-like model of the desired casting is placed in an oven preheated to an ideal burn out temperature. The oven is maintained at that temperature while the pressure in the oven is increased to a predetermined pressure and maintained at that pressure for a given time. Following that time, the pressure is cycled between the predetermined pressure and atmospheric pressure or below for a second predetermined time.
    Type: Grant
    Filed: August 31, 1978
    Date of Patent: July 22, 1980
    Assignee: Ceram-Dent, Inc.
    Inventor: Stanley E. Rose
  • Patent number: 4211567
    Abstract: A ceramic molding composition comprising an alcoholate of aluminum or a metal of the fourth sub-group of the Periodic System, a refractory metal oxide and a polyvalent alcohol, an improvement in the formation of a ceramic product wherein a ceramic molding composition is shaped and hardened, which improvement resides in employing the above defined ceramic molding composition.
    Type: Grant
    Filed: June 22, 1978
    Date of Patent: July 8, 1980
    Assignee: Dynamit Nobel Aktiengesellschaft
    Inventors: Werner Dittrich, Walter Josten, Heinz Nestler, Friedhelm Schnippering
  • Patent number: 4195683
    Abstract: The present invention provides an improved method of forming a metal article having a plurality of airfoils which extend outwardly from a hub. The metal airfoils are formed separately from the hub. In forming a mold to cast the article, blade portions of the metal airfoils are coated with wax. The metal airfoils are then placed in a circular array and are covered with a coating of liquid ceramic mold material. This wet coating of ceramic mold material is dried to form an annular mold wall section having a plurality of recesses in which the blades of the metal airfoils are disposed. The wax coating over the metal airfoil blades is subsequently removed from the recesses to provide space between the blades and the side walls of the recesses. The annular mold wall section in which the blade containing recesses are formed is then connected with top and bottom mold sections to further define a mold cavity having a configuration corresponding to the hub portion of the article.
    Type: Grant
    Filed: December 14, 1977
    Date of Patent: April 1, 1980
    Assignee: TRW Inc.
    Inventor: William S. Blazek
  • Patent number: 4172867
    Abstract: Method and apparatus for preparing a wax replica of a dental prosthesis is disclosed. The method of the invention is carried out by preparing a composite dental model which includes a base portion, an odontal die projecting from the base portion having a cavity in which the dental prosthesis is to be implanted, and an index pin embedded within the composite dental model. A complementary dental model having an odontal projection defining an occlusal surface for engaging the odontal die is also prepared. The index pin includes an anchor shank portion embedded within the odontal die, an alignment shank portion embedded in the base portion and a radially projecting collar portion disposed in the interface of the base portion and the odontal die. The odontal die and embedded index pin are removed from the base portion of the composite dental model and a die spacer is placed around the alignment shank portion of the index pin.
    Type: Grant
    Filed: August 31, 1978
    Date of Patent: October 30, 1979
    Inventor: Zachary P. Devault
  • Patent number: 4159204
    Abstract: A ceramic molding composition comprising an alcoholate of aluminum or a metal of the fourth sub-group of the Periodic System, a refractory metal oxide and an agent selected from the group consisting of diketones of the formula ##STR1## wherein R.sub.1 and R.sub.2 are each independently an aliphatic radical of between C.sub.1 and C.sub.18 carbon atoms or an aromatic radical from C.sub.6 to C.sub.18 carbon atoms, a hydroxycarboxylic acid compound of the formula ##STR2## wherein R.sub.3 is an aliphatic radical of C.sub.1 and C.sub.18 or an aromatic radical from C.sub.6 to C.sub.18, and R.sub.4 is hydrogen or an alkyl radical of C.sub.1 to C.sub.4, and a polyvalent alcohol, an improvement in the formation of a ceramic product wherein a ceramic molding composition is shaped and hardened, which improvement resides in employing the above defined ceramic molding composition.
    Type: Grant
    Filed: January 17, 1977
    Date of Patent: June 26, 1979
    Assignee: Dynamit Nobel Aktiengesellschaft
    Inventors: Werner Dittrich, Walter Josten, Heinz Nestler, Friedhelm Schnippering
  • Patent number: 4147201
    Abstract: A method of manufacturing a mold adapted to be used for casting bodies of ber-reinforced composites. A model of the body to be cast is prepared and coated with a one piece dense shell of refractory metallic oxide deposited by plasma or flame spraying and the model is then separated from the shell by conventional physical or chemical treatment.
    Type: Grant
    Filed: February 18, 1976
    Date of Patent: April 3, 1979
    Assignees: Office National d'Etudes et de Recherches Aerospatiales (O.N.E.R.A.), Microfusion S.A.
    Inventors: Maurice Rabinovitch, Pierre Magnier
  • Patent number: 4133368
    Abstract: An improved mold for casting single crystal metallic articles is disclosed and comprises a ceramic investment mold having a main article cavity and having embedded at its lower end below the article cavity and in communication therewith a preformed ceramic single crystal starter insert. The preformed starter insert generates a plurality of single metallic crystals in a growth cavity and then selects one crystal for further propagation through the article cavity. A method for making such a mold is also disclosed.
    Type: Grant
    Filed: August 1, 1977
    Date of Patent: January 9, 1979
    Assignee: United Technologies Corporation
    Inventor: Douglas R. Hayes
  • Patent number: 4111252
    Abstract: Disclosed is an improved method for making molds and mold components for use in casting single crystal articles. According to the improved method, a preformed and reusable replica of a mold growth cavity and crystal selector passage is provided, the replica including a cylinder in the form of the desired growth cavity and a helical strand in the form of the desired crystal selector passage, one end of the strand being attached to an end of the cylinder such that their axes are coincident. In one embodiment, the replica is coated with a thin layer of wax or other removable material and then utilized in a variety of mold making processes, including investment molding, to form a growth zone and helical crystal selector in the mold.
    Type: Grant
    Filed: August 1, 1977
    Date of Patent: September 5, 1978
    Assignee: United Technologies Corporation
    Inventors: Edward G. Day, Edmund Dziobek
  • Patent number: 4109699
    Abstract: A pattern assembly for use in the lost pattern process of investment casting characterized by a center tree or sprue member including a central stem and a plurality of laterally projecting collars spaced apart along the stem and united therewith to provide the surface area for gating the patterns, the cross-sectional size of the stem being greater than the projecting width of the collar, whereby the stem serves to form a riser.
    Type: Grant
    Filed: March 5, 1976
    Date of Patent: August 29, 1978
    Assignee: Precision Metalsmiths, Inc.
    Inventors: Robert R. Miller, Robert A. Horton