Patents by Inventor Robert Charles Kallgren

Robert Charles Kallgren 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).

  • Publication number: 20190178344
    Abstract: A directional link chain includes a directional indication element configured to indicate the travel direction of chain wheel operators, such as a chain fall or roll-up door. During operation of the chain fall, for example, the directional indication element indicates the travel direction for an attached load. The directional indication element includes both a vertical and a horizontal indication for a multitude of applications. The improved link chain enables an operator to visually recognize the gear system direction and corresponding attached load direction via the directional indication element to efficiently move the attached load the desired direction without trial and error.
    Type: Application
    Filed: February 19, 2018
    Publication date: June 13, 2019
    Inventor: Robert Charles Kallgren
  • Patent number: D846427
    Type: Grant
    Filed: December 8, 2017
    Date of Patent: April 23, 2019
    Assignee: Honu Management LLC
    Inventor: Robert Charles Kallgren