Patents by Inventor Douglas N. Muller

Douglas N. Muller 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).

  • Digester cover left-in-place ballast ring
    Patent number: 11498752
    Abstract: A sludge digester including a vessel and floating cover. The vessel includes a sidewall and an interior volume configured to receive and contain sludge. According to one embodiment, the cover comprises a frame structure that is constructed and arranged to form a skirt member formed at a periphery of the cover and extending downwardly into the vessel, and a continuous ballast ring attached to a lower portion of the skirt member and configured to form a trough member with an interior surface of the skirt member. The sludge digester may also include a guide system coupled to the sidewall and the skirt member and configured to allow vertical displacement of the cover with change in volume of at least one of a gas and a sludge contained in the vessel beneath the cover.
    Type: Grant
    Filed: May 14, 2020
    Date of Patent: November 15, 2022
    Assignee: Evoqua Water Technologies LLC
    Inventors: Matthew P. Bronk, Douglas N. Muller, Thomas Mangione
  • Digester Cover Left-in-Place Ballast Ring
    Publication number: 20210094754
    Abstract: A sludge digester including a vessel and floating cover. The vessel includes a sidewall and an interior volume configured to receive and contain sludge. According to one embodiment, the cover comprises a frame structure that is constructed and arranged to form a skirt member formed at a periphery of the cover and extending downwardly into the vessel, and a continuous ballast ring attached to a lower portion of the skirt member and configured to form a trough member with an interior surface of the skirt member. The sludge digester may also include a guide system coupled to the sidewall and the skirt member and configured to allow vertical displacement of the cover with change in volume of at least one of a gas and a sludge contained in the vessel beneath the cover.
    Type: Application
    Filed: May 14, 2020
    Publication date: April 1, 2021
    Applicant: Evoqua Water Technologies LLC
    Inventors: Matthew P. Bronk, Douglas N. Muller, Thomas Mangione
  • Digester cover left-in-place ballast ring
    Patent number: 10683162
    Abstract: A sludge digester including a vessel and floating cover. The vessel includes a sidewall and an interior volume configured to receive and contain sludge. According to one embodiment, the cover comprises a frame structure that is constructed and arranged to form a skirt member formed at a periphery of the cover and extending downwardly into the vessel, and a continuous ballast ring attached to a lower portion of the skirt member and configured to form a trough member with an interior surface of the skirt member. The sludge digester may also include a guide system coupled to the sidewall and the skirt member and configured to allow vertical displacement of the cover with change in volume of at least one of a gas and a sludge contained in the vessel beneath the cover.
    Type: Grant
    Filed: May 15, 2018
    Date of Patent: June 16, 2020
    Assignee: Evoqua Water Technologies LLC
    Inventors: Matthew P. Bronk, Douglas N. Muller, Thomas Mangione
  • Digester Cover Left-in-Place Ballast Ring Form
    Publication number: 20180334322
    Abstract: A sludge digester including a vessel and floating cover. The vessel includes a sidewall and an interior volume configured to receive and contain sludge. According to one embodiment, the cover comprises a frame structure that is constructed and arranged to form a skirt member formed at a periphery of the cover and extending downwardly into the vessel, and a continuous ballast ring attached to a lower portion of the skirt member and configured to form a trough member with an interior surface of the skirt member. The sludge digester may also include a guide system coupled to the sidewall and the skirt member and configured to allow vertical displacement of the cover with change in volume of at least one of a gas and a sludge contained in the vessel beneath the cover.
    Type: Application
    Filed: May 15, 2018
    Publication date: November 22, 2018
    Inventors: Matthew Bronk, Douglas N. Muller, Thomas Mangione