Patents by Inventor Bertram J. Marcus

Bertram J. Marcus 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).

  • Contraceptive suppository
    Patent number: 4187286
    Abstract: A suppository especially adapted for vaginal insertion to act as a contraceptive which comprises a mixture of polyethylene glycol, a spermicidally-active ingredient, a thickening agent, an effervescent agent and alginic acid, the action of the alginic acid reacting with the effervescent agent in moist conditions to form carbon dioxide and also forming a viscous barrier adherent to the vaginal walls to prevent penetration of the sperm.
    Type: Grant
    Filed: January 2, 1979
    Date of Patent: February 5, 1980
    Assignee: G&W Laboratories, Inc.
    Inventor: Bertram J. Marcus