Patents by Inventor James B. Hakko

James B. Hakko 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: 4141719
    Abstract: Improved, high-purity agglomerated tantalum powders having an exceptional combination of a relatively low oxygen content, high green strength when pressed into compacts without using any binders, and, when compacted and sintered as anodes for capacitors have reduced shrinkage of the pressed compacts during sintering, and have high electrical capacitance and breakdown voltage along with low direct current leakage and low dissipation factor. Such powder is produced by milling hydrided high-purity tantalum metal ingots to a powder of specified particle size and size distribution, subjecting the powder to a heat treatment at a temperature T-1 to degas and preagglomerate it, milling and screening the degassed and preagglomerated powder to preferably about -200 mesh size, subjecting the -200 mesh powder to a higher temperature T-2 to reagglomerate it, milling and screening the reagglomerated powder to about -35 mesh, and blending the final powder.
    Type: Grant
    Filed: May 31, 1977
    Date of Patent: February 27, 1979
    Assignee: Fansteel Inc.
    Inventor: James B. Hakko
  • Patent number: 4017302
    Abstract: Improved, high-purity agglomerated tantalum powders characterized by exceptionally high green strength when pressed without using a carbonaceous binder into low density anodes and high electrical capacitance along with low direct current leakage and dissipation factor in the anodes after sintering.
    Type: Grant
    Filed: February 4, 1976
    Date of Patent: April 12, 1977
    Assignee: Fansteel Inc.
    Inventors: Victor T. Bates, Stanley S. Fry, James B. Hakko