Patents by Inventor Andrew C. Duncan

Andrew C. Duncan 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).

  • Electromagnetic wave reducing heaters and devices and saunas
    Patent number: 12004283
    Abstract: Systems may include a heater including a plurality of heating elements that may include a first heating element configured to generate heat based on a first current, and a second heating element configured to generate heat based on a second current. Systems may further include an electromagnetic (EM) radiation reducing device configured to cancel electromagnetic emissions from the heater. The EM radiation reducing device may include a first EM radiation reduction element positioned adjacent to a first side of the heater, and a second EM radiation reduction element positioned adjacent to a second side of the heater, where the first and second EM radiation reduction elements have geometries configured based, at least in part, on the heater.
    Type: Grant
    Filed: March 20, 2023
    Date of Patent: June 4, 2024
    Assignee: SAUNA WORKS INC.
    Inventors: Raleigh C. Duncan, Andrew Kaps
  • Metal cleaning and de-icing compositions
    Patent number: 5858947
    Abstract: A metal cleaning composition comprising EDDS is described. Preferably, the compositions comprise optical isomers of EDDS, such as (s,s)EDDS. The compositions are particularly well suited for cleaning iron, zinc, aluminum, and copper. De-icer compositions comprising EDDS are also described. Also disclosed are processes for using the compositions.
    Type: Grant
    Filed: August 27, 1997
    Date of Patent: January 12, 1999
    Assignee: The Associated Octel Company Limited
    Inventors: John A. MacMillan, Mark L. Brewer, Andrew C. Duncan