Patents by Inventor Silke Friedrich

Silke Friedrich 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).

  • Sulphate-reducing bacterial strains and their use in the decontamination of water contaminated with sulphuric acid, metals and radioactive substances
    Patent number: 6080572
    Abstract: The present invention relates to Gram-negative sulfate-reducing bacteria strains which grow under anaerobic conditions at pH values between 3.9 and 9.5 and temperatures between 3.degree. C. and 45.degree. C. and which reduce sulfate to sulfide, utilize methanol as a source of carbon and energy, do not require further carbon and energy sources in addition to methanol, and are tolerant to metals. The present invention further relates to methods of decontaminating sulfuric-acid, metal-containing and radioactively contaminated water, particularly methods of decontaminating pit and flooding water in disused uranium mines or washing water from soil refining plants.
    Type: Grant
    Filed: March 27, 1998
    Date of Patent: June 27, 2000
    Assignee: UFZ-Umweltforschungszentrum Leipzig-Halle GmbH
    Inventors: Barbara Hard, Wolfgang Babel, Silke Friedrich