Patents by Inventor Donna M. Derstadt

Donna M. Derstadt 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).

  • Anionic surfactant-containing detergent compositions having soil-release properties
    Patent number: 4116885
    Abstract: Detergent compositions, particularly effective in removing oily soils from hydrophobic fibers, such as polyester, are disclosed, containing specific anionic surface-active agents, polyester soil-release polymers, and which may contain only limited amounts of certain incompatible anionic surface-active agents. The process of laundering fabrics in aqueous solutions of these compositions is also disclosed.
    Type: Grant
    Filed: September 23, 1977
    Date of Patent: September 26, 1978
    Assignee: The Procter & Gamble Company
    Inventors: Donna M. Derstadt, Douglas W. Moeser
  • Process for making granular detergent composition
    Patent number: 4083813
    Abstract: A process for the preparation of spray-dried granular detergent compositions containing an ethoxylated nonionic surfactant and a zwitterionic surfactant, wherein the degradation of the zwitterionic surfactant during processing is minimized, is disclosed. In the process, the nonionic and zwitterionic components are intimately mixed, in the absence of alkaline components, prior to their addition to an aqueous alkaline crutcher mix, which is formed into detergent granules by spray-drying.
    Type: Grant
    Filed: January 31, 1977
    Date of Patent: April 11, 1978
    Assignee: The Procter & Gamble Company
    Inventors: Rodney Mahlon Wise, Donna M. Derstadt