Patents by Inventor Parmely H. Pritchard

Parmely H. Pritchard 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).

  • Bioremediation of soil or groundwater contaminated with compounds in creosote by two-stage biodegradation
    Patent number: 5614410
    Abstract: A process for remediating contaminated soil or groundwater using a strain of Pseudomonas paucimobilis designated NRRL B-18512 is disclosed. Further, the process is a two stage sequential process wherein in the first stage bacteria which degrade low molecular weight polycyclic aromatic hydrocarbons, heterocyclic organic compounds and phenolics are used in a pretreatment step. However, the remaining high molecular weight compounds are treated in a second step of the process with the Pseudomonas paucimobilis strain since the strain is not inhibited by low molecular weight compounds because these are removed in the first pretreatment step. Therefore, repeated inoculation of the strain is not necessary and the overall process disclosed eliminates the inhibitory effects of the low molecular weight compounds.
    Type: Grant
    Filed: September 19, 1994
    Date of Patent: March 25, 1997
    Assignees: SBP Technologies, Inc., The United States of America as represented by the Administrator of the United States Enviromental Protection Agency
    Inventors: James G. Mueller, Parmely H. Pritchard, Suzanne Lantz
  • Biodegradation of aliphatic chloroethylene compounds
    Patent number: 5071755
    Abstract: A method of degrading halogenated aliphatic hydrocarbons is disclosed comprising incubating microorganisms capable of degrading halogenated aliphatic hydrocarbons by an aromatic degradative pathway together with the halogenated aliphatic hydrocarbons under conditions such that said aromatic degradative pathway is active.
    Type: Grant
    Filed: July 9, 1990
    Date of Patent: December 10, 1991
    Assignees: Ecova Corporation, The United States of America as represented by the Administrator of the Environmental Protection Agency
    Inventors: Michael J. K. Nelson, Al Willis J. Bourquin, Parmely H. Pritchard
  • Biodegradation of chloroethylene compounds
    Patent number: 4959315
    Abstract: A method of degrading chloroethylene compounds is disclosed comprising incubating microorganisms capable of degrading chloroethylene compounds by an aromatic degradative pathway together with the chloroethylene compounds under conditions such that the aromatic degradative pathway is active.
    Type: Grant
    Filed: April 30, 1987
    Date of Patent: September 25, 1990
    Assignee: The United States of America as represented by the Administrator of the Environmental Protection Agency
    Inventors: Michael J. K. Nelson, Al W. J. Bourquin, Parmely H. Pritchard