Patents by Inventor Robert W. Purdy

Robert W. Purdy 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).

  • Blood collection monitoring device and method
    Patent number: 4267837
    Abstract: This invention is directed to apparatus and a method for monitoring the collection of blood from a donor so as to minimize trauma to the blood so collected. The system closely monitors the rate of collection of blood and regulates the rate of mixing of anticoagulant therewith so as to maintain a substantially constant ratio of anticoagulant to blood throughout the collection process. The system also includes built-in warning devices for indicating when the collection process is not proceeding according to a prescribed pattern.
    Type: Grant
    Filed: September 27, 1979
    Date of Patent: May 19, 1981
    Assignee: SBR Lab Inc.
    Inventors: Robert W. Purdy, Don A. Arneson