Patents by Inventor Sigmund Katz

Sigmund Katz 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).

  • High strength feldspathic dental porcelains containing crystalline leucite
    Patent number: 4798536
    Abstract: Translucent feldspathic dental porcelain compositions and dental restoration made therefrom exhibiting a crystalline leucite content of at least about 45% by weight, wherein said leucite crystallites exhibit a size of less than about 35 microns, comprising:______________________________________ Component Percentage (by weight) ______________________________________ SiO.sub.2 55-70 Al.sub.2 O.sub.3 16-20 CaO 0.5-5.0 MgO 0.5-5.0 Li.sub.2 O 1.0-5.0 Na.sub.2 O 2.0-5.0 K.sub.2 O 12.5-22.5 Ce.sub.2 O.sub.3 0-1.0 ______________________________________said dental restorations exhibit a compressive strength of at least about 125,000 p.s.i., a flexural strength of at least about 16,000 p.s.i., and a diametral tensile strength of at least about 6,000 p.s.i., thereby obviating the need for metal as ceramic supports.
    Type: Grant
    Filed: December 1, 1987
    Date of Patent: January 17, 1989
    Assignee: American Thermocraft Corp.
    Inventor: Sigmund Katz