Patents by Inventor Gary H. KOOPMAN

Gary H. KOOPMAN 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).

  • Propeller sound field modification systems and methods
    Patent number: 9816529
    Abstract: A propeller system for an aircraft includes an assembly for modifying a sound field of the propeller system. The propeller system includes a rotor supported for rotation about a rotor axis. The rotor has a central hub and a plurality of blades each extending outwardly from the hub to a tip. The rotor and blades are operable to propel an aircraft to travel in a direction. The rotor blades define a rotor plane perpendicular to the rotor axis. The blade tips define a circumferential rotational path as the blades are rotated by the rotor. The propeller system includes an acoustic resonator or multiple resonators having openings disposed within a distance to the propeller blade tip that is small compared to the wavelength of the propeller's fundamental blade tone and proximate to the rotor plane. The resonators are excited by tip flow of the blade as it passes the opening.
    Type: Grant
    Filed: October 15, 2013
    Date of Patent: November 14, 2017
    Assignee: KCF TECHNOLOGIES, INC.
    Inventors: Michael D. Grissom, Gary H. Koopman
  • PROPELLER SOUND FIELD MODIFICATION SYSTEMS AND METHODS
    Publication number: 20150056058
    Abstract: A propeller system for an aircraft includes an assembly for modifying a sound field of the propeller system. The propeller system includes a rotor supported for rotation about a rotor axis. The rotor has a central hub and a plurality of blades each extending outwardly from the hub to a tip. The rotor and blades are operable to propel an aircraft to travel in a direction. The rotor blades define a rotor plane perpendicular to the rotor axis. The blade tips define a circumferential rotational path as the blades are rotated by the rotor. The propeller system includes an acoustic resonator or multiple resonators having openings disposed within a distance to the propeller blade tip that is small compared to the wavelength of the propeller's fundamental blade tone and proximate to the rotor plane. The resonators are excited by tip flow of the blade as it passes the opening.
    Type: Application
    Filed: October 15, 2013
    Publication date: February 26, 2015
    Applicant: KCF TECHNOLOGIES, INC.
    Inventors: Michael D. GRISSOM, Gary H. KOOPMAN