Patents by Inventor David J. Pettitt

David J. Pettitt 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).

  • Low-acetyl gellan gum blends
    Patent number: 4647470
    Abstract: Blends of low-acetyl gellan gum with xanthan gum and locust bean gum are described. The combination of xanthan gum/locust bean gum modifies the brittleness of the gellan gum gel and provides a useful range and diversity of gel textures which find particular utility in gelled food formulations. In place of locust bean gum, konjak, tara, or Cassia gums may be used.
    Type: Grant
    Filed: November 27, 1985
    Date of Patent: March 3, 1987
    Assignee: Merck & Co., Inc.
    Inventors: George R. Sanderson, Ross C. Clark, Ken Clare, David J. Pettitt
  • Cellulase-free xanthan gum and process for producing same
    Patent number: 4070535
    Abstract: Intimate intermingling, as in a tumble reactor, of wet particulate xanthan gum, with either propylene oxide, .beta.-propiolactone, glutaraldehyde or pivalolactone, as essentially the only gas present, at about 40.degree.-70.degree. C., for from 1-5 hours, produces xanthan gum in which the cellulase enzyme is inactivated, but in which the viscosity of solutions is increased; the propylene oxide is removed to afford a residual propylene oxide content of not more than 300 ppm in the product xanthan gum.
    Type: Grant
    Filed: August 22, 1975
    Date of Patent: January 24, 1978
    Assignee: Merck & Co., Inc.
    Inventors: Richard A. Empey, David J. Pettitt