Patents by Inventor Ulrich Fotheringham

Ulrich Fotheringham 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).

  • Single-mode optical, fiber and process for its production
    Patent number: 5013131
    Abstract: A single-mode optical fiber is doped to achieve a number of desired properties and have a refractive index profile n(r). The doped fiber must at least approximate the formula: ##EQU1## in which n.sub.o means the refractive index of the matrix material and r.sub.i =i.multidot..DELTA.r. A process for the production of the single-mode optical fiber is disclosed using at least 100 layers.
    Type: Grant
    Filed: April 12, 1989
    Date of Patent: May 7, 1991
    Assignee: Schott Glaswerke
    Inventor: Ulrich Fotheringham