Patents by Inventor Hans-Dieter Bartholoma

Hans-Dieter Bartholoma 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).

  • Thread control device for a chainstitch sewing machine
    Patent number: 5899156
    Abstract: A thread control device for a chainstitch sewing machine comprises a thread feeder which is moved simultaneously with the stitching needle by the drive means for the stitching needle. The thread feeder is attached in such a manner as to be able to oscillate at a pivot drive which is allocated to a shaft rotatably mounted in the upper arm casing of the sewing machine.
    Type: Grant
    Filed: April 17, 1997
    Date of Patent: May 4, 1999
    Assignee: Union Special GmbH
    Inventors: Dieter Schopf, Hans-Dieter Bartholoma
  • Sewing machine presser device, with chaining-off foot
    Patent number: 5537943
    Abstract: A sewing machine comprises a workpiece presser device having a presser foot and a separate chaining-off foot. There is an independent holding down device for each foot which makes it possible to adjust both the presser foot pressure and also the chaining-off foot pressure by variable resilient forces.
    Type: Grant
    Filed: January 17, 1995
    Date of Patent: July 23, 1996
    Assignee: Union Special GmbH
    Inventors: Hans-Dieter Bartholoma, Milan Petrovic, Gernot Nedoschinsky, Johannes Strauss
  • Looper for a single-thread chainstitch sewing machine
    Patent number: 5445091
    Abstract: A looper (2) for single-thread chainstitch sewing machines comprises for the purpose of forming a chainstitch a thread guiding surface (22), which is disposed substantially parallel to the feed path of the looper. A thread driving device (23) and a thread retaining device (24), which is formed as a retaining step (25), render possible the interlinking of a sewing thread (8) with itself. (FIG.
    Type: Grant
    Filed: September 20, 1994
    Date of Patent: August 29, 1995
    Assignee: Union Special GmbH
    Inventor: Hans-Dieter Bartholoma