Patents by Inventor Frances M. Cummings

Frances M. Cummings 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).

  • Stabilization of methylchloroform
    Patent number: 4326924
    Abstract: Methylchloroform undergoing purification distillation is stabilized against decomposition by conducting the distillation in the presence of polyalkylene glycol having an average molecular weight greater than 150.
    Type: Grant
    Filed: November 17, 1980
    Date of Patent: April 27, 1982
    Assignee: PPG Industries, Inc.
    Inventor: Frances M. Cummings
  • Method for increasing the ultra-violet light transmittance of ethylene glycol
    Patent number: 4289593
    Abstract: The ultraviolet light transmittance of ethylene glycol containing ultraviolet light absorbing impurities is increased by exposing the ethylene glycol to ultraviolet radiation at a wavelength of at least 220 nanometers from a controllable ultraviolet radiation emission source.
    Type: Grant
    Filed: March 5, 1980
    Date of Patent: September 15, 1981
    Assignee: PPG Industries, Inc.
    Inventors: Robert G. Briody, Frances M. Cummings