Patents by Inventor Frederic J. M. Ferry

Frederic J. M. Ferry 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).

  • Glass-ceramic article, process for its production and thermally crystallizable glass
    Patent number: 4786617
    Abstract: This invention relates to the preparation of glass-ceramic articles in which potassium fluorrichterite and/or a related fluormica constitutes the predominant crystal phase(s). The precursor glasses can be crystallized in situ very rapidly and exhibit very little thermal deformation during the crystallization heat treatment. The base glasses are essentially free of Li.sub.2 O and consist essentially, expressed in terms of weight percent on the oxide basis, of:______________________________________ SiO.sub.2 61-70 Na.sub.2 O 0.5-3 BaO 0-3.5 Al.sub.2 O.sub.3 2.75-7 K.sub.2 O 2.5-5.5 P.sub.2 O.sub.5 0-2.5 MgO 11-16 Na.sub.2 O + K.sub.2 O <6.8 CaO 4.75-9 F 2-3.
    Type: Grant
    Filed: March 3, 1988
    Date of Patent: November 22, 1988
    Assignee: Corning Glass Works
    Inventors: Andre Andrieu, Marie J. M. Comte, Frederic J. M. Ferry, Jean-Pierre Mazeau