Patents by Inventor Mary Beth Letscher

Mary Beth Letscher 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).

  • Use of anionic surfactant/dispersant blends for the deinking of groundwood newsprint
    Patent number: 5387355
    Abstract: A composition and method for the improved deinking of groundwood newsprint is disclosed. The composition comprises an amount, effective for the intended purpose, of: 1) an anionic surfactant, e.g., the ammonium or sodium salts of a sulfated ethoxylate derived from a 12 to 14 carbon linear primary alcohol blend, and 2) a dispersant, e.g., naphthalene-formaldehyde condensates.The method comprises administering a sufficient amount of this combined treatment to a sample of groundwood newsprint for which treatment is desired.
    Type: Grant
    Filed: January 21, 1994
    Date of Patent: February 7, 1995
    Assignee: Betz Laboratories, Inc.
    Inventor: Mary Beth Letscher
  • Process and composition for deinking dry toner electrostatic printed wastepaper
    Patent number: 5302242
    Abstract: A process and composition for deinking dry toner electrostatic printed wastepaper is disclosed. The composition comprises a combination of at least two of the following components: (a) aliphatic petroleum distillates, (b) an alkylphenoxypoly-(ethyleneoxy) ethanol and (c) an ethoxylated polyoxypropylene glycol.The process comprises administering a sufficient amount of the composition to a sample of electrostatic printed wastepaper for which treatment is desired.
    Type: Grant
    Filed: April 20, 1992
    Date of Patent: April 12, 1994
    Assignee: PaperChem Inc. Betz
    Inventors: Sandra K. Richmann, Mary Beth Letscher
  • Process and composition for deinking dry toner electrostatic printed wastepaper
    Patent number: 5282997
    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: June 5, 1992
    Date of Patent: February 1, 1994
    Assignee: Betz PaperChem, Inc.
    Inventors: Sandra K. Richmann, Mary Beth Letscher
  • Use of anionic surfactant/dispersant blends for the deinking of groundwood newsprint
    Patent number: 5281348
    Abstract: A composition and method for the improved deinking of groundwood newsprint is disclosed. The composition comprises an amount, effective for the intended purpose, of: 1) an anionic surfactant, e.g., the ammonium or sodium salts of a sulfated ethoxylate derived from a 12 to 14 carbon linear primary alcohol blend, and 2) a dispersant, e.g., naphthalene-formaldehyde condensates. The method comprises administering a sufficient amount of this combined treatment to a sample of groundwood newsprint for which treatment is desired.
    Type: Grant
    Filed: November 12, 1991
    Date of Patent: January 25, 1994
    Assignee: Betz PaperChem, Inc.
    Inventor: Mary Beth Letscher
  • Use of surfactants having an HLB less than 10 in the deinking of dry toner electrostatic printed wastepaper
    Patent number: 5248388
    Abstract: A method for deinking dry toner electrostatic printed wastepaper is disclosed. The method comprises administering a sufficient amount of a surfactant with a hydrophile/lipophile balance of from about 0.5 to 10.0 to a sample of electrostatic printed wastepaper for which treatment is desired.
    Type: Grant
    Filed: April 20, 1992
    Date of Patent: September 28, 1993
    Assignee: Betz PaperChem, Inc.
    Inventors: Sandra K. Richmann, Mary Beth Letscher
  • 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