Patents by Inventor Stanley Block

Stanley Block 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 pressure process for producing transformation toughened ceramics
    Patent number: 4771022
    Abstract: Toughening agents are produced by the application of high pressure, sufficient to transform a powder material into a denser high pressure polymorph. When the pressure is released, the high pressure phase is retrieved metastably at ambient conditions of pressure and temperature. The amount of high pressure phase retained at ambient conditions depends on the relative hydrostaticity of the pressurized environment and particle size of the powder. The high pressure phase is almost completely retained in a hydrostatic environment. One embodiment of the process of the present invention produces pressure transformation toughened zirconia comprising a high pressure phase having a symmetry no greater than tetragonal (defined as tetragonal II) dispersed within a matrix of a less dense monoclinic phase.
    Type: Grant
    Filed: February 18, 1987
    Date of Patent: September 13, 1988
    Assignee: The United States of America as represented by the Secretary of Commerce
    Inventors: Stanley Block, Gasper J. Piermarini