Patents by Inventor Robert Boyd Johnston

Robert Boyd Johnston 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: 20240308167
    Abstract: The present disclosure describes embodiments of a twin-screw press for extracting vegetable oils, and a process for extracting vegetable oils and/or seeds. Particularly, the twin-screw press provides a reduction in machine cost and maintenance due to low operating torque requirements and allows an improved operation with the oil extraction being greater than the oil loss. This is a consequence of allowing lower processing temperatures and pressures due to the geometry of the screw and the gap that it has with the draining element of the press cage. This also permits reducing the possibility of material jamming or co-rotation of the cake in the press.
    Type: Application
    Filed: March 14, 2024
    Publication date: September 19, 2024
    Inventors: Robert BOYD JOHNSTON, Maria del Pilar NORIEGA ESCOBAR, Walter RITZEL FESKE
  • Patent number: 6550376
    Abstract: A screw press with twin screws is provided with discontinuities or interruptions 7 in the flighting 8 of the screws 2. Stationary resistor teeth 9 protrude at these interruptions into the flow of material being pressed.
    Type: Grant
    Filed: January 23, 2001
    Date of Patent: April 22, 2003
    Inventor: Robert Boyd Johnston
  • Publication number: 20020096062
    Abstract: A screw press with twin screws is provided with discontinuities or interruptions 7 in the flighting 8 of the screws 2. Stationary resistor teeth 9 protrude at these interruptions into the flow of material being pressed.
    Type: Application
    Filed: January 23, 2001
    Publication date: July 25, 2002
    Inventor: Robert Boyd Johnston
  • Patent number: 6117321
    Abstract: An adjustable elastic support is provided for a filtering sleeve. A tilting body 1 has one extremity with an inlet 2. A filter unit 3 is lodged inside the body 1. The lower portion of the body 1 is provided with an outlet 5 for the filtrate. An outlet 6 for solids of the filtration process is also provided. The tilting body 1 is assembled on a frame 7 through a pivot 8 and an inclination regulation device 9. The filtering unit 3 includes a filtering sleeve 10 operated conjunction with a rotor 11. Sleeve 10 is assembled on the filtering unit 3 through supports 12, 19 and 22. The supports 12 and 19 are movable and are associated with a tension adjusting device 21.
    Type: Grant
    Filed: January 25, 1999
    Date of Patent: September 12, 2000
    Inventor: Robert Boyd Johnston