Patents by Inventor Diosie Velazquez

Diosie Velazquez 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).

  • Charged porous filter
    Patent number: 5114585
    Abstract: A process for preparing charge modified filtration media including the steps of forming a filtration microporous or macroporous membranous or nonmembranous medium structure having internal and external surfaces and including a quaternizable nitrogen containing polymer exposed at the internal and external surfaces, permanently charging the exposed quaternizable nitrogen, and rendering the polymer insoluble in solution and permanently adhered within the filtration medium structure.Charge modified filtration media including a filtration medium structure as described having internal and external surfaces, characterized by a quaternizable nitrogen containing polymer exposed at the internal and external surfaces and having permanently charged quaternizable nitrogen. The quaternized nitrogen containing polymer is insoluble in solution and permanently adhered within the filtration medium structure.
    Type: Grant
    Filed: December 27, 1989
    Date of Patent: May 19, 1992
    Assignee: Gelman Sciences, Inc.
    Inventors: Menahem Kraus, Diosie Velazquez, Chan-Hong Wang