Patents by Inventor Martin G. Drexhage

Martin G. Drexhage 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).

  • Photorefractive effect in bulk chalcogenide glass and devices made therefrom
    Patent number: 5136677
    Abstract: The photorefractive effect results in a change in the refractive index of bulk chalcogenide glass when it is exposed to certain wavelengths of light, in particular, sub-band-gap light. The effect results in a variety of device structures including a fiber optic faceplate; an optical waveguide; a fiber tap; a lens and a Bragg grating. Methods for fabricating the various devices are described.
    Type: Grant
    Filed: June 6, 1991
    Date of Patent: August 4, 1992
    Assignee: Galileo Electro-Optics Corporation
    Inventors: Martin G. Drexhage, Lee M. Cook, Tracey L. Margraf, Cornelius T. Moynihan
  • Photorefractive effect in bulk glass and devices made therefrom
    Patent number: 5028105
    Abstract: The photorefractive effect results in a change in the refractive index of bulk chalcogenide glass when it is exposed to certain wavelengths of light, in particular, sub-band-gap light. The effect results in a variety of device structures including a fiber optic faceplate; an optical waveguide; a fiber tap; a lens and a Bragg grating. Methods for fabricating the various devices are described.
    Type: Grant
    Filed: December 21, 1989
    Date of Patent: July 2, 1991
    Assignee: Galileo Electro-Optics Corporation
    Inventors: Martin G. Drexhage, Lee M. Cook, Tracey L. Margraf, Cornelius T. Moynihan
  • Method of making composite borosilicate glass articles
    Patent number: 4244721
    Abstract: A method for producing a glass article which comprises melting and forming a preshaped glass article having a composition in the phase separable regions of the alkali-boro-silicate or alkali-boro-germania-silicate systems, inducing the article to phase separate, leaching out a silica-poor phase from the surface layers only to form a structure having porous surface layers surrounding a solid region of substantially the original glass composition, washing this structure with an organic media which dissolves oxides of boron and other leaching reaction products, drying and heating to collapse the outer porous structure to form a glass having a silica-rich surface layer surrounding a solid region having substantially the original glass composition.
    Type: Grant
    Filed: January 31, 1979
    Date of Patent: January 13, 1981
    Assignees: Pedro Buarque de Macedo, Theodore A. Litovitz
    Inventors: Prabhat K. Gupta, Martin G. Drexhage, Pedro B. de Macedo