Patents by Inventor David L. Doherty

David L. Doherty 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).

  • Soil analysis method including saturation/drying test using undisturbed core sample
    Patent number: 5672814
    Abstract: An improved soil analysis is provided which provides accurate data representative of actual physical conditions of the soil. Preferably, the method involves first obtaining a core sample of soil having an essentially undisturbed naturally occurring compaction and stratification and subjecting at least a portion of this undisturbed core sample to one or more physical tests such as water permeability, water holding capacity and porosity tests. Thereafter, the sample portion is divided into vertically aligned strata and the latter are individually tested for organic content, silt and clay content and sand content.
    Type: Grant
    Filed: May 20, 1996
    Date of Patent: September 30, 1997
    Inventor: David L. Doherty
  • Turf analysis method employing substantially undisturbed core samples and strata thereof
    Patent number: 5672813
    Abstract: An improved soil analysis is provided which provides accurate data representative of actual physical conditions of the soil. Preferably, the method involves first obtaining a core sample of soil having an essentially undisturbed naturally occurring compaction and stratification and subjecting at least a portion of this undisturbed core sample to one or more physical tests such as water permeability, water holding capacity and porosity tests. Thereafter, the sample portion is divided into vertically aligned strata and the latter are individually tested for organic content, silt and clay content and sand content.
    Type: Grant
    Filed: May 20, 1996
    Date of Patent: September 30, 1997
    Inventor: David L. Doherty
  • Soil analysis method including separate analyses of core sample strata
    Patent number: 5668306
    Abstract: An improved soil analysis is provided which provides accurate data representative of actual physical conditions of the soil. Preferably, the method involves first obtaining a core sample of soil having an essentially undisturbed naturally occurring compaction and stratification and subjecting at least a portion of this undisturbed core sample to one or more physical tests such as water permeability, water holding capacity and porosity tests. Thereafter, the sample portion is divided into vertically aligned strata and the latter are individually tested for organic content, silt and clay content and sand content.
    Type: Grant
    Filed: May 17, 1996
    Date of Patent: September 16, 1997
    Inventor: David L. Doherty