Patents by Inventor Jacobus W. C. van der Ligt

Jacobus W. C. van der Ligt 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 having a protective coating
    Patent number: 4913715
    Abstract: A method of and a device for manufacturing an optical fiber with a protective coating. A cooling device cools the fiber after drawing from a preform. The cooling device comprises a forced-cooled double-walled tube. In the space enclosed by the inner tube through which the fiber to be cooled is passed, a gas is present which has good heat-transporting properties. The gas may be, for example, helium. Cooling of the fiber takes place by heat dissipation via the helium to the forced-cooled tube wall.
    Type: Grant
    Filed: December 8, 1988
    Date of Patent: April 3, 1990
    Assignee: U.S. Philips Corp.
    Inventors: Cornelis M. G. Jochem, Jacobus W. C. Van Der Ligt
  • Method of arrangement for coating a fibre
    Patent number: 4765271
    Abstract: A method of and an apparatus for providing a bubble-free coating on a fibre, more particularly on an optical fibre. A fibre to be coated is fed into a pressure chamber (61) via an inlet duct (56) with a restricted inlet opening (57) and leaves the pressure chamber (61) through an outlet opening (41) of a nozzle (40). Liquid coating material is supplied to the pressure chamber (61) at such a pressure that the coating material rises in the inlet duct (56) up to a certain level to form a convex meniscus (D). By flushing the surroundings of the inlet opening (57) with a gas having a kinematic viscosity which is lower than that of air, the drawing speed at which the applied coating is still bubble-free can be considerably increased.
    Type: Grant
    Filed: July 2, 1987
    Date of Patent: August 23, 1988
    Assignee: U.S. Philips Corporation
    Inventors: Cornelius M. G. Jochem, Jacobus W. C. Van Der Ligt
  • Method of and arrangement for coating a fibre
    Patent number: 4704307
    Abstract: A method of and an apparatus for providing a bubble-free coating on a fibre, more particularly on an optical fibre. A fibre to be coated is fed into a pressure chamber (61) via an inlet duct (56) with a restricted inlet opening (57) and leaves the pressure chamber (61) through an outlet opening (41) of a nozzle (40). Liquid coating material is supplied to the pressure chamber (61) at such a pressure that the coating material rises in the inlet duct (56) up to a certain level to form a convex meniscus (D). By flushing the surroundings of the inlet opening (57) with a gas having a kinematic viscosity which is lower than that of air, the drawing speed at which the applied coating is still bubble-free can be considerably increased.
    Type: Grant
    Filed: April 17, 1986
    Date of Patent: November 3, 1987
    Assignee: U.S. Philips Corporation
    Inventors: Cornelis M. G. Jochem, Jacobus W. C. van der Ligt
  • Arrangement for coating optical fibres
    Patent number: 4644898
    Abstract: An arrangement for coating a fibre, more particularly an optical fibre, comprising a housing (31) with a pressure chamber (61) which is in communication with a connection (63) for the supply of liquid coating material. A fibre to be coated is supplied via a guide duct (59) in a tubular guide member (55), traverses the pressure chamber (61) and leaves the device (11) via an outlet opening (41) in a nozzle (40). The tubular guide member (55) is made of an elastically deformable material. By means of two spindles (79), the end of the tubular guide member (55) can be adjusted so that the coating is centered with respect to the fibre and a coaxial location of fibre and coating is obtained.
    Type: Grant
    Filed: September 26, 1985
    Date of Patent: February 24, 1987
    Assignee: U.S. Philips Corporation
    Inventors: Cornelis M. G. Jochem, Jacobus W. C. van der Ligt