Patents by Inventor Pieter van der Ree

Pieter van der Ree 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 manufacturing an optical fiber preform
    Patent number: 4793843
    Abstract: While collapsing the central duct in hollow glass optical fiber preforms, an etchant consisting of a mixture of oxygen and a fluorocarbon compound from the group C.sub.2 F.sub.6, C.sub.3 F.sub.8 and N-C.sub.4 F.sub.10 is passed through the duct. In particular, the etchant is passed through the duct only when the duct's diameter is 1 mm or smaller. The resulting solid preforms and optical fibers drawn therefrom do not have a central dip in the refractive index profile.
    Type: Grant
    Filed: March 20, 1987
    Date of Patent: December 27, 1988
    Assignee: U.S. Philips Corporation
    Inventors: Rene A. M. Pluijms, Pieter van der Ree, Gerrit J. Koel, Jan G. J. Peelen