Patents by Inventor Leonard Armstrong

Leonard Armstrong 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).

  • Fluid powered dual-piston actuator with efficient fluid porting and method of implementation
    Patent number: 7591216
    Abstract: In an actuator, a first piston is attached to a first toothed rack, and a second piston is attached to a second toothed rack. A rotary member is attached to one pinion mating with the first or second toothed racks. A first volume is disposed in the cavity on one side of the first piston. A second volume is disposed in the cavity on another side of the first piston. A third volume is disposed on a side of the second piston opposite the second volume. A first fluid port is in fluid communication with the first volume via a primary fluid passage. A second fluid port, which is external to the cavity, is in fluid communication with the second volume. A fluid passage in the housing, external to the cavity and separate from the primary fluid passage connects the first and third volumes independently of the primary fluid passage.
    Type: Grant
    Filed: April 5, 2006
    Date of Patent: September 22, 2009
    Assignee: Metso Automation USA Inc.
    Inventors: David Bayreuther, Leonard Armstrong
  • Fluid powered dual-piston actuator with efficient fluid porting and method of implementation
    Publication number: 20070234899
    Abstract: In an actuator, a first piston is attached to a first toothed rack, and a second piston is attached to a second toothed rack. A rotary member is attached to one pinion mating with the first or second toothed racks. A first volume is disposed in the cavity on one side of the first piston. A second volume is disposed in the cavity on another side of the first piston. A third volume is disposed on a side of the second piston opposite the second volume. A first fluid port is in fluid communication with the first volume via a primary fluid passage. A second fluid port, which is external to the cavity, is in fluid communication with the second volume. A fluid passage in the housing, external to the cavity and separate from the primary fluid passage connects the first and third volumes independently of the primary fluid passage.
    Type: Application
    Filed: April 5, 2006
    Publication date: October 11, 2007
    Applicant: Metso Automation USA Inc.
    Inventors: David Bayreuther, Leonard Armstrong