Patents by Inventor Joseph M. Ramstack

Joseph M. Ramstack 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 and apparatus for plasmapheresis by reciprocatory pulsatile filtration
    Patent number: 4769150
    Abstract: Blood is oscillated between an inlet and an outlet of a flow path on a membrane during plasmapheresis by filtration.
    Type: Grant
    Filed: July 18, 1986
    Date of Patent: September 6, 1988
    Assignee: E. I. Du Pont De Nemours and Company
    Inventor: Joseph M. Ramstack
  • Plasmapheresis method and apparatus for overcoming membrane fouling
    Patent number: 4753733
    Abstract: Plasmapheresis by filtration can be carried out with high efficiency for long periods by conducting blood over a surface of a membrane and passing plasma at an accelerating rate until the threshold level is attained, maintaining the rate of passing plasma until the ceiling system transmembrane pressure difference is attained and then reducing the passing of plasma and the system transmembrane pressure difference and allowing the membrane to clear before repeating the cycle.
    Type: Grant
    Filed: July 18, 1986
    Date of Patent: June 28, 1988
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Joseph M. Ramstack