Patents by Inventor Sietse J. Koopmans

Sietse J. Koopmans 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).

  • Patent number: 5195725
    Abstract: Displaceable winch device comprising a separate drive unit with an output drive shaft and a separate winching unit connectable thereto, wherein said drive unit comprises a frame, a unit compartment with a combustion motor delimited within said frame, a drive gear coupled thereto and comprising said output drive shaft, and a motor cooling water cooler, and in addition an operating compartment in which is arranged a seating position having operating means grouped therearound. Said frame reaches substantially to just above the seat of said seating position, that said unit compartment extends beneath said seating position and that said cooling water cooler is fitted in the portion of said unit compartment extending beneath said seating position.
    Type: Grant
    Filed: April 4, 1990
    Date of Patent: March 23, 1993
    Inventor: Sietse J. Koopmans