Patents by Inventor Helga Melger

Helga Melger 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).

  • Anticaries agents
    Patent number: 4020019
    Abstract: Polyethylenimine mono-and difluorophosphates are obtained by the reaction of solutions of polyethylenimines with monofluorophosphoric acid or difluorophosphoric acid at low temperatures. The novel polyethylenimine salts have demonstrated valuable properties in the prevention of dental caries.
    Type: Grant
    Filed: January 29, 1975
    Date of Patent: April 26, 1977
    Inventors: Gianluigi Soldati, Ralph G. Eilberg, Helga Melger, William M. Wooding
  • Dental prophylaxis containing alkylamine fluorophosphates
    Patent number: 4011310
    Abstract: Novel alkylamine fluorophosphates of the formula: ##STR1## wherein R is a linear or branched alkyl group containing 1-20 carbon atoms; R.sub.1 is lower alkyl or hydrogen, R.sub.2 is alkyl or hydrogen; X is 1 or 2; Y is 1 when X=1; Y is 1 or 2 when X=2; m and n are positive whole integers whose sum is 3. When R, R.sub.1 and R.sub.2 are alkyl they can be substituted with an hydroxy group. The novel fluorophosphates have been found to be effective in reducing the acid solubility of tooth enamel.
    Type: Grant
    Filed: October 20, 1975
    Date of Patent: March 8, 1977
    Assignee: Carter-Wallace, Inc.
    Inventors: Gianluigi Soldati, Ralph G. Eilberg, Helga Melger, David A. Schlichting