Patents by Inventor Richard A. Sachleben

Richard A. Sachleben 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).

  • Fluoro-alcohol phase modifiers and process for cesium solvent extraction
    Patent number: 6566561
    Abstract: The invention relates to a class of phenoxy fluoro-alcohols, their preparation, and their use as phase modifiers and solvating agents in a solvent composition for the extraction of cesium from alkaline solutions. These phenoxy fluoro-alcohols comply with the formula: in which n=2 to 4; X represents a hydrogen or a fluorine atom, and R2-R6 are hydrogen or alkyl substituents. These phenoxy fluoro-alcohol phase modifiers are a necessary component to a robust solvent composition and process useful for the removal of radioactive cesium from alkaline nuclear waste streams. The fluoro-alcohols can also be used in solvents designed to extract other cesium from acidic or neutral solutions.
    Type: Grant
    Filed: November 2, 2000
    Date of Patent: May 20, 2003
    Assignee: The United States of America as represented by the Department of Energy
    Inventors: Peter V. Bonnesen, Bruce A. Moyer, Richard A. Sachleben
  • Calixarene crown ether solvent composition and use thereof for extraction of cesium from alkaline waste solutions
    Patent number: 6174503
    Abstract: A solvent composition and corresponding method for extracting cesium (Cs) from aqueous neutral and alkaline solutions containing Cs and perhaps other competing metal ions is described. The method entails contacting an aqueous Cs-containing solution with a solvent consisting of a specific class of lipophilic calix[4]arene-crown ether extractants dissolved in a hydrocarbon-based diluent containing a specific class of alkyl-aromatic ether alcohols as modifiers. The cesium values are subsequently recovered from the extractant, and the solvent subsequently recycled, by contacting the Cs-containing organic solution with an aqueous stripping solution. This combined extraction and stripping method is especially useful as a process for removal of the radionuclide cesium-137 from highly alkaline waste solutions which are also very concentrated in sodium and potassium.
    Type: Grant
    Filed: September 3, 1998
    Date of Patent: January 16, 2001
    Assignee: Lockheed Martin Energy Research Corporation
    Inventors: Bruce A. Moyer, Richard A. Sachleben, Peter V. Bonnesen, Derek J. Presley
  • Nucleosides with 5'-O-photolabile protecting groups
    Patent number: 5556961
    Abstract: Nucleosides with photolabile protecting groups on the 5'-hydroxyl. These nucleosides are useful in the sythesis of nucleic acids on solid-state arrays.
    Type: Grant
    Filed: October 24, 1994
    Date of Patent: September 17, 1996
    Inventors: Robert S. Foote, Richard A. Sachleben
  • Process for extracting technetium from alkaline solutions
    Patent number: 5443731
    Abstract: A process for extracting technetium values from an aqueous alkaline solution containing at least one alkali metal hydroxide and at least one alkali metal nitrate, the at least one alkali metal nitrate having a concentration of from about 0.1 to 6 molar. The solution is contacted with a solvent consisting of a crown ether in a diluent for a period of time sufficient to selectively extract the technetium values from the aqueous alkaline solution. The solvent containing the technetium values is separated from the aqueous alkaline solution and the technetium values are stripped from the solvent.
    Type: Grant
    Filed: July 21, 1994
    Date of Patent: August 22, 1995
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Bruce A. Moyer, Richard A. Sachleben, Peter V. Bonnesen