Patents by Inventor Ronald C. Robertson

Ronald C. Robertson 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).

  • Evacuation pump control for a centrifuge instrument
    Patent number: 4857811
    Abstract: A centrifuge instrument has a vacuum pump responsive to a rotor recognition arrangement. The pump is operative to provide a predetermined pressure level in the chamber compatible with which one of a plurality of rotors is mounted within the chamber. The requested angular velocity can also be used to control the pressure level in the chamber.
    Type: Grant
    Filed: March 31, 1988
    Date of Patent: August 15, 1989
    Assignee: E. I. Du Pont De Nemours and Company
    Inventors: Lawrence R. Barrett, Ronald C. Robertson, Mark A. Sullivan