Patents by Inventor Randal W. Waite

Randal W. Waite 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).

  • Sampling pumps and closed loop control of sampling pumps to load traps
    Patent number: 11154794
    Abstract: Certain configurations of devices and systems which are configured to draw a selected volume of an air sample into a trap are described. In some examples, the devices and systems comprise a pump and a mass flow sensor to draw a selected volume of the air sample through a trap even where variable restriction occurs.
    Type: Grant
    Filed: October 9, 2017
    Date of Patent: October 26, 2021
    Assignee: PerkinElmer Health Sciences, Inc.
    Inventors: Nathan L. Porter, Anthony D. Rands, Randal W. Waite, Kenneth D. Nemelka, Chad B Grant
  • Thermal gradient chromatography devices and methods of using them
    Patent number: 10379089
    Abstract: Certain configurations described herein are directed to gas chromatography devices. In some instances, the gas chromatography devices may comprise at least one heating device which can be moved along a chromatography column to provide a thermal gradient to the chromatography column. In other instances, the gas chromatography devices may comprise a heating device that can receive a moving chromatography column to provide a thermal gradient to the chromatography column. The gas chromatography devices may be configured as portable devices which can be used to perform remote analyzes.
    Type: Grant
    Filed: October 29, 2016
    Date of Patent: August 13, 2019
    Assignee: PerkinElmer Health Sciences, Inc.
    Inventors: Edgar D Lee, Nathan L Porter, Randal W Waite
  • SAMPLING PUMPS AND CLOSED LOOP CONTROL OF SAMPLING PUMPS TO LOAD TRAPS
    Publication number: 20180140970
    Abstract: Certain configurations of devices and systems which are configured to draw a selected volume of an air sample into a trap are described. In some examples, the devices and systems comprise a pump and a mass flow sensor to draw a selected volume of the air sample through a trap even where variable restriction occurs.
    Type: Application
    Filed: October 9, 2017
    Publication date: May 24, 2018
    Inventors: Nathan L. Porter, Anthony D. Rands, Randal W. Waite, Kenneth D. Nemelka, Chad A. Grant
  • THERMAL GRADIENT CHROMATOGRAPHY DEVICES AND METHODS OF USING THEM
    Publication number: 20170131243
    Abstract: Certain configurations described herein are directed to gas chromatography devices. In some instances, the gas chromatography devices may comprise at least one heating device which can be moved along a chromatography column to provide a thermal gradient to the chromatography column. In other instances, the gas chromatography devices may comprise a heating device that can receive a moving chromatography column to provide a thermal gradient to the chromatography column. The gas chromatography devices may be configured as portable devices which can be used to perform remote analyses.
    Type: Application
    Filed: October 29, 2016
    Publication date: May 11, 2017
    Inventors: Edgar D. Lee, Nathan L. Porter, Randal W. Waite