Patents by Inventor L. Willard Richards

L. Willard Richards 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).

  • Cleaning apparatus and process
    Patent number: 5082502
    Abstract: Particles adhering to the internal surfaces of an object are removed by the movement of a shock wave past the surfaces. The shock wave is generated by the explosion of a gas in a chamber located inside the object. The invention has particular application for use in cleaning process equipment.
    Type: Grant
    Filed: September 8, 1988
    Date of Patent: January 21, 1992
    Assignee: Cabot Corporation
    Inventors: Kam B. Lee, Allan C. Morgan, L. Willard Richards, Dan K. Puckett
  • Photographic method for monitoring visibility through measurement of transmittance and path radiance
    Patent number: 4921349
    Abstract: A photographic method of collecting and reducing photographic film density data for monitoring air quality is disclosed in which photographic film is first calibrated using calibration scales of known reflectance and the measured radiance of one calibration scale step to relate the photographic film density to the known radiance. Measurement of a target's radiance and sight path radiance is made via target photographic image density analysis and mathematical expressions which convert density information into radiance and/or atmospheric transmittance data using expressions developed from the calibration scale data.
    Type: Grant
    Filed: June 30, 1987
    Date of Patent: May 1, 1990
    Assignee: Sonoma Technology
    Inventor: L. Willard Richards