Patents by Inventor Roger H. Giovanetto

Roger H. Giovanetto 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).

  • Method for the recovery of steviosides from plant raw material
    Patent number: 4892938
    Abstract: The invention relates to a method for recovering steviosides from dried plant material of Stevia rebaudiana Bertoni by extraction and purification. An extract is obtained through treatment in water at a temperature from room temperature to about 65.degree. C. with stirring and subsequent filtration and centrifugation. This extract is treated with calcium hydroxide, whereupon a precipitate is obtained by means of filtration or centrifugation. This precipitate is treated with a strongly acidic ion exchange resin and subsequently with a weakly basic ion exchange resin, filtered and dried.
    Type: Grant
    Filed: July 20, 1988
    Date of Patent: January 9, 1990
    Inventor: Roger H. Giovanetto