Patents by Inventor Maria R. de Gracia

Maria R. de Gracia 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).

  • Chemical reagent indicator for the in vitro diagnosis of pregnancy
    Patent number: 4433057
    Abstract: A chemical reagent for the in vitro diagnosis of pregnancy in a female mammal; said reagent to be added to a urine sample and containing(a) a buffer solution having a pH of 5.2 to 6.6;(b) a dye colorimetrically responsive to HCG; and(c) a chemical component for adjusting and stabilizing the pH of the urine sample to 4-5.
    Type: Grant
    Filed: February 5, 1982
    Date of Patent: February 21, 1984
    Inventor: Maria R. de Gracia