Patents Assigned to Witec Cayman Patents, Limited
  • Patent number: 5613183
    Abstract: The disclosure relates to a method of binder removal from a green body before sintering or the like wherein the green body is initially heated to a temperature above the melting or flow point of the binder to liquify the binder and, at the elevated temperature, a small portion of the green body is brought into intimate contact with a non-supporting porous body of lower capillarity potential for the liquid binder. The liquid is drawn from all parts of the green body to the region of contact between the porous body and the green body and enters the body of lower capillarity potential preferentially, removing liquid from the green body through the surface of the green body only at said region of contact. The draining is continued with or without further increase in temperature until the green body is opened or becomes permeable.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: March 18, 1997
    Assignee: Witec Cayman Patents Limited
    Inventor: Raymond E. Wiech, Jr.
  • Patent number: 4415528
    Abstract: A method of forming precision metal alloy shaped parts starting with small particles of the individual metals and/or individual compounds containing the metals of the targeted metal alloy and a binder. A mix is initially formed of metals and/or compounds of the metals required to form a targeted alloy wherein the metal percent of each metal and/or compound is provided whereby the targeted alloy will be provided. The sizes of the particles of the metals and/or alloys are as small as possible and preferably in the range from one tenth of a micron to ten microns. These particles are mixed with an appropriate binder to form a homogeneous mass.
    Type: Grant
    Filed: March 20, 1981
    Date of Patent: November 15, 1983
    Assignee: Witec Cayman Patents, Limited
    Inventor: Raymond E. Wiech, Jr.
  • Patent number: 4404166
    Abstract: A method and system whereby binder can be removed from a green body much more rapidly than in prior art systems without interfering with the integrity or aesthetics of the final part by providing a binder system having at least two components and preferably a mold release agent, the binder system having differing melting points. Each binder component can have parts with different melting temperature. When the temperature is raised to a point above the intermediate temperature at which the binder system flows, binder will proceed to exude to the surface of the green body wherefrom it can be removed.The binder is removed from the surface of the green body by blowing a non-saturated chemically inert atmosphere over the surface of the green body rapidly whereby the atmosphere at a region near the surface of the green body does not become saturated with the binder vapors.
    Type: Grant
    Filed: January 22, 1981
    Date of Patent: September 13, 1983
    Assignee: Witec Cayman Patents, Limited
    Inventor: Raymond E. Wiech, Jr.