Patents by Inventor Henricus M. J. M. van Ass

Henricus M. J. M. van Ass 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).

  • Method of producing optical fibers for telecommunications
    Patent number: 4242117
    Abstract: When producing a glass fiber, having a graded refractive index profile, by means of the double crucible method, the initial materials being core and cladding glass compositions having mutually different alkali ions, a profile is usually obtained which greatly deviates from the desired parabolic form. The invention furnishes the possibility of approximating this parabolic form very closely. This is attained by a partial substitution of the core alkali ion by the cladding alkali ion.
    Type: Grant
    Filed: December 26, 1978
    Date of Patent: December 30, 1980
    Assignee: U.S. Philips Corporation
    Inventor: Henricus M. J. M. van Ass