Patents by Inventor Michael Hoffart

Michael Hoffart 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).

  • Optical fiber draw furnace having a SiC or Silicon Nitride tube
    Patent number: 6658897
    Abstract: An apparatus for drawing a fiber (11), particularly an optical glass fiber, from a heated preform (9), has a tubular heating element (1), which encloses preform (9) at least partly in its longitudinal direction, and an induction coil (4) surrounding tubular heating element (1) at a radial distance. Along an inside surface (19) of the tubular heating element (1) a protective tube (20) is provided, which surrounds fiber (11) and preform (9) at a radial distance. Protective tube (20) reliably prevents burning off of the heating element and thus a deterioration of the properties of the fiber (11).
    Type: Grant
    Filed: March 26, 2002
    Date of Patent: December 9, 2003
    Assignee: Alcatel
    Inventors: Jurgen Berndt, Michael Hoffart, Norbert Nowack
  • Apparatus for drawing a fiber
    Publication number: 20020100297
    Abstract: An apparatus for drawing a fiber (11), particularly an optical glass fiber, from a heated preform (9), has a tubular heating element (1), which encloses preform (9) at least partly in its longitudinal direction, and an induction coil (4) surrounding tubular heating element (1) at a radial distance. Along an inside surface (19) of the tubular heating element (1) a protective tube (20) is provided, which surrounds fiber (11) and preform (9) at a radial distance. Protective tube (20) reliably prevents burning off of the heating element and thus a deterioration of the properties of the fiber (11).
    Type: Application
    Filed: March 26, 2002
    Publication date: August 1, 2002
    Applicant: ALCATEL
    Inventors: Jurgen Berndt, Michael Hoffart, Norbert Nowack
  • Optical fiber with a color marking
    Patent number: 5796905
    Abstract: In an optical fiber (1) with a coating (8) for the cladding of one or more plastic layers containing the fiber core and a color marking (3) on or in the outer plastic layer, the color marking (3) is covered by a further transparent or translucent layer (4).
    Type: Grant
    Filed: July 29, 1996
    Date of Patent: August 18, 1998
    Assignee: Kabel Rheydt Aktiengesellschaft
    Inventors: Michael Hoffart, Jurgen Rosenkranz, Franz-Peter Bartling, Bertram Glessner, Hans-Jurgen Lysson
  • Optical fiber with additional color markings
    Patent number: 5377292
    Abstract: To increase the identification characteristics of optical fibers (9) with one or more protective covers (10, 11) and an external color coating (12) of UV-hardened varnish, additional different color identification markings (13) are integrated into the external color coating (12).
    Type: Grant
    Filed: March 26, 1993
    Date of Patent: December 27, 1994
    Assignee: Kabel Rheydt A.G.
    Inventors: Franz-Peter Bartling, Rainer Broden, Helmut Haag, Michael Hoffart, Hans-Jurgen Lysson, Peter Zamzow