Patents by Inventor Marvin R. DeVries

Marvin R. DeVries 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).

  • Stop leak composition
    Patent number: 4872911
    Abstract: A method of using a particulate matter formed of a tri-dimensional cross-linked superabsorbent hydrogel for stopping leaks in a cooling system of a vehicle. The hydrogel is added to a filled coolant system and the engine is run for a period of time until the leakage stops.
    Type: Grant
    Filed: April 21, 1988
    Date of Patent: October 10, 1989
    Inventors: David H. Walley, Marvin R. DeVries
  • Method for determining effective reservoir porosity
    Patent number: 4346592
    Abstract: A clay content curve, for the borehole under investigation is developed through logging procedures such as a gamma ray log or a spectral gamma ray log. Additionally, compaction trend curves based upon historic logging data are obtained for the geologic area of interest. Information provided by the total porosity trend curve is corrected using a function of the shaliness indicator curve. This correction allows the deviation of an effective porosity log for the reservoir which can be recorded or can be used to edit porosity logs.
    Type: Grant
    Filed: September 3, 1980
    Date of Patent: August 31, 1982
    Assignee: Dresser Industries, Inc.
    Inventors: Walter H. Fertl, Marvin R. DeVries