Patents by Inventor John A. MacPherson

John A. MacPherson 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: 4225345
    Abstract: The disclosed process forms metal parts from a mixture containing a powdered metal, a plasticizer, and at least two binders. Some of these binder materials are selectively extractable from the mixture without sintering. After the mixture is shaped into the form of the desired part and prior to sintering, the plasticizer and the extractable binders are removed. This produces a part having both sufficient green strength and a relatively low binder content. On sintering, remaining binders decompose; and the resulting part has a carbon content of less than 1.0%.
    Type: Grant
    Filed: August 8, 1978
    Date of Patent: September 30, 1980
    Inventors: James M. Adee, John A. MacPherson