Patents by Inventor John N. Simpson

John N. Simpson 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).

  • SETTLED DUST MEASUREMENT SYSTEM USING PHOTORESISTORS
    Publication number: 20240102909
    Abstract: A method includes projecting light to obtain a reference measurement using a first photoresistor; collecting dust on a platform during a collection time interval; and projecting light across the platform to obtain a dust measurement using the first photoresistor or a second photoresistor.
    Type: Application
    Filed: September 28, 2023
    Publication date: March 28, 2024
    Inventors: Robert W. Baxter, Derrick J. Hinkle, Ralph E. Bard, John N. Simpson