Patents by Inventor Sandra K. Richman

Sandra K. Richman 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).

  • Process and composition for deinking dry toner electrostatic printed wastepaper
    Patent number: 5141598
    Abstract: A composition and method for deinking dry toner electrostatic printed wastepaper is disclosed. The composition comprises a combination of: (1) aliphatic petroleum distillates, (2) an alkylphenoxypoly-(ethyleneoxy) ethanol, and (3) an ethoxylated polyoxypropylene glycol.The method comprises administering a sufficient amount of this combination to a sample of electrostatic printed wastepaper for which treatment is desired.
    Type: Grant
    Filed: April 25, 1991
    Date of Patent: August 25, 1992
    Assignee: Betz PaperChem, Inc.
    Inventors: Sandra K. Richman, Mary Beth Letscher