Patents by Inventor Roger G. Ackerman

Roger G. Ackerman 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).

  • Potassium ion-exchange on surface of beta-spodumene
    Patent number: 4074993
    Abstract: This invention relates to the strengthening of glass-ceramic articles wherein the crystal content thereof comprises the predominant portion and containing beta-spodumene solid solution as the principal crystal phase. The strengthening effect is accomplished through an ion exchange process taking place within a surface layer of the article such that potassium ions from an external source are exchanged for lithium ions in the crystal phase thereby causing compressive stresses to be set up in the surface layer.
    Type: Grant
    Filed: March 18, 1968
    Date of Patent: February 21, 1978
    Assignee: Corning Glass Works
    Inventors: Roger G. Ackerman, Bruce R. Karstetter