Patents by Inventor Rene A. M. Pluijms

Rene A. M. Pluijms 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 optical fibres having a core and a cladding of glass applying the rod-in-tube technique
    Patent number: 4854956
    Abstract: The invention relates to a method of manufacturing optical fibres in which a quartz glass tube is coated on the inside with core material, the assembly is contracted to form a solid rod which is then inserted into a quartz glass tube, after which the assembly is drawn. The last tube is thermally treated to eliminate contaminations at the surface which may detrimentally influence the tensile strength of the ultimate fibre.
    Type: Grant
    Filed: October 6, 1988
    Date of Patent: August 8, 1989
    Assignee: U.S. Philips Corp.
    Inventors: Rene A. M. Pluijms, Emmanuel Papanikolau, Leendert B. Jongeling, Johannes M. A. Van Esdonk
  • 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
  • Method of manufacturing solid glass preforms from hollow preforms
    Patent number: 4746345
    Abstract: Solid glass preforms are made by externally heating a tubular preform by a plasma which is reciprocated along the hollow tube. The plasma gas consists entirely or partly of a molecular gas (N.sub.2 or O.sub.2, for example). The hollow preform is preferably rotated during collapsing.
    Type: Grant
    Filed: October 2, 1986
    Date of Patent: May 24, 1988
    Assignee: U.S. Philips Corp.
    Inventors: Rene A. M. Pluijms, Jacob W. de Ruiter, Hubertus J. E. M. Schrans, Johannes P. de Meij