Patents by Inventor Karl Hopfensperger

Karl Hopfensperger 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 process using liquefied petroleum gas
    Patent number: 8550750
    Abstract: A method is provided for stimulating anaerobic degradation of a subsurface contaminant, comprising the steps of vaporizing liquefied petroleum gas (LPG) to form a treating gas and directing the treating gas to at least one subsurface injection site that includes the subsurface contaminant; wherein the treating gas stimulates anaerobic degradation of at least a portion of the subsurface contaminant.
    Type: Grant
    Filed: May 7, 2009
    Date of Patent: October 8, 2013
    Assignee: CDM Smith Inc.
    Inventors: Patrick J. Evans, Karl Hopfensperger
  • BIOREMEDIATION PROCESS USING LIQUEFIED PETROLEUM GAS
    Publication number: 20110236136
    Abstract: A method is provided for stimulating anaerobic degradation of a subsurface contaminant, comprising the steps of vaporizing liquefied petroleum gas (LPG) to form a treating gas and directing the treating gas to at least one subsurface injection site that includes the subsurface contaminant; wherein the treating gas stimulates anaerobic degradation of at least a portion of the subsurface contaminant.
    Type: Application
    Filed: May 7, 2009
    Publication date: September 29, 2011
    Inventors: Patrick J. Evans, Karl Hopfensperger