Patents by Inventor Rosa Li

Rosa Li 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).

  • Dicalcium phosphate dihydrate for fluoride dentifrice compositions
    Patent number: 4828823
    Abstract: The monofluorophosphate compatibility of dicalcium phosphate dihydrate can be improved in processes in which a slaked lime slurry is reacted with phosphoric acid to form a monocalcium phosphate solution to which is added magnesium oxide, additional lime slurry and pyrophosphoric acid with later removal of the dicalcium phosphate dihydrate. The improvement involved adding the magnesium oxide at 0.3%-2% and adding 0.1%--less than 0.5% of trimagnesium phosphate to the recovered dicalcium phosphate dihydrate.
    Type: Grant
    Filed: April 7, 1986
    Date of Patent: May 9, 1989
    Assignee: Stauffer Chemical Company
    Inventor: Rosa Li