Patents by Inventor David Joseph Schaefer

David Joseph Schaefer 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).

  • Retractable tarping system
    Patent number: 7841642
    Abstract: A retractable tarping system including an end support surface, a shaft, a tarp, a spool, an end plate assembly, and a cable. The tarp and the spool are operably attached to the shaft. The end plate assembly is attached to the shaft for movement with respect to the first end support surface. The cable is attached to the end support surface and extends at least one time around the first spool.
    Type: Grant
    Filed: December 29, 2008
    Date of Patent: November 30, 2010
    Assignee: Shur Company
    Inventor: David Joseph Schaefer
  • RETRACTABLE TARPING SYSTEM
    Publication number: 20100164246
    Abstract: A retractable tarping system including an end support surface, a shaft, a tarp, a spool, an end plate assembly, and a cable. The tarp and the spool are operably attached to the shaft. The end plate assembly is attached to the shaft for movement with respect to the first end support surface. The cable is attached to the end support surface and extends at least one time around the first spool.
    Type: Application
    Filed: December 29, 2008
    Publication date: July 1, 2010
    Applicant: Shur Company
    Inventor: David Joseph Schaefer
  • RAIL CAR EXTENSION SYSTEM
    Publication number: 20090260538
    Abstract: A rail car extension system including a first main rail section, a second main rail section and a plurality of bow structures. The first main rail section is mounted with respect to an upper surface of the first side wall. The first main rail section includes a first upper rail portion and a first lower rail portion that extends from the first upper rail portion. The second main rail section is mounted with respect to an upper surface of the second side wall. The second main rail section includes a second upper rail portion and a second lower rail portion that extends from the second upper rail portion. The plurality of bow structures are each attached to and extend between the first main rail section and the second main rail section.
    Type: Application
    Filed: April 6, 2009
    Publication date: October 22, 2009
    Applicant: Shur Company
    Inventors: Christopher Joseph McCallum, David Joseph Schaefer, Derrick K. Barr