Patents by Inventor Mark A. Roffman

Mark A. Roffman 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 compensating for environmental effect
    Patent number: 5520329
    Abstract: A method and apparatus for measuring and compensating for the impact of environmental effects on industrial processing units. A thermal test element having a low thermal mass and high conductivity is exposed to the environment. Ambient air temperature is sensed at a nearby location, and a differential temperature controller determines how much energy is required to maintain the test element at a desired temperature differential from ambient temperature. Duty cycle and wattage outputs enable feedforward compensation for environmentally induced process unit control disturbances.
    Type: Grant
    Filed: April 1, 1994
    Date of Patent: May 28, 1996
    Assignee: Chevron Research and Technology Company, a Division of Chevron U.S.A. Inc.
    Inventors: Russell M. Clinton, III, William P. Jones, Mark A. Roffman