Patents by Inventor Burleigh M. Hutchins, Jr.

Burleigh M. Hutchins, Jr. 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).

  • Pumping apparatus
    Patent number: 3981620
    Abstract: A compact pumping system especially useful in liquid chromatography wherein comprising a liquid path which is fully flushed in each stroke of a pump, a pump which provides substantially pulse-free flow, a pressure-sensor integrated into said flow path and operably connected to the control circuit of a bifilar stepping motor. This circuit is so designed that the driving current applied to the motor is only that required to pump the liquid. The avoiding of heat associated with a greater current is particularly important in forming a compact package of motor and pump for use in liquid chromatography.
    Type: Grant
    Filed: November 19, 1973
    Date of Patent: September 21, 1976
    Assignee: Waters Associates, Inc.
    Inventors: Louis Abrahams, Burleigh M. Hutchins, Jr., James L. Waters
  • Pump control systems
    Patent number: 3958898
    Abstract: A compact pumping system especially useful in liquid chromatography wherein comprising a liquid path which is fully flushed on each stroke of a pump, a pump which provides substantially pulse-free flow, a pressure-sensor integrated into said flow path and operably connected to the control circuit of a bifilar stepping motor. This circuit is so designed that the driving current applied to the motor is only that required to pump the liquid. The avoiding of heat associated with a greater current is particularly important in forming a compact package of motor and pump for use in liquid chromatography.
    Type: Grant
    Filed: February 3, 1975
    Date of Patent: May 25, 1976
    Assignee: Waters Associates, Incorporated
    Inventors: Louis Abrahams, Burleigh M. Hutchins, Jr., James L. Waters