Patents

1.  Brereton, Clive and Berretta, Sergio.  Method and apparatus for vaporizing liquid chlorine containing   nitrogen trichloride. U.S. Patent 10,377,629, filed March 6, 2010 and issued August 13, 2019.

2.  Mahecha-Botero, Andres, and Li, Xuantian.  Gas treatment process and apparatus.  U.S. Patent 10,350,543, filed August 12, 2015 and issued July 16, 2019.

3.  Lockhart, James, Symons, Peter and Genders, David.  Purification process for partly-hydrolyzed cellulose. US Patent 10,016,726, filed February 28, 2014 and issued July 10, 2018.

4.  Lockhart, James.  Purification process for partly-hydrolyzed cellulose. U.S. Patent 9,567,707, filed August 21, 2012 and issued February 14, 2017.

5.  Guenkel, Alfred and Berretta, Sergio.  Removal of non-aromatic impurities from a nitration process. U.S. Patent 9,139,509, filed February 17, 2011 and issued September 22, 2015.

6.  Berretta, Sergio.  Washing system for nitroaromatic compounds. U.S. Patent 9,040,758, filed August 18, 2009 and issued May 26, 2015.

7.  Gattrell, Mike.  Process for adiabatic production of mononitrotoluene. U.S. Patent 8,907,144, filed March 22, 2012 and issued December 9, 2014.

8Gattrell, Mike.  Sub-critical partial oxidation for treatment of nitration wastes. U.S. Patent 8,801,932, filed May 14, 2010 and issued August 12, 2014.

9.  Berretta, Sergio.  Adiabatic process for making mononitrobenzene. U.S. Patent 8,692,035, filed November 10, 2008 and issued April 8, 2014.

10.  Berretta, Sergio and Boyd, David.  Method for reducing the formation of by-product dinitrobenzene in the production of mononitrobenzene. U.S. Patent 8,692,035, filed November 14, 2008 and issued December 10, 2013.

11.  Foan, Jonathan and Wearing, James.  Maintenance of sulfur concentration in Kraft pulp processes. U.S. Patent 8,246,779, filed September 24, 2010 and issued August 12, 2012.

 

12.  Pollock, David. Circular clarifier apparatus and method. U.S. Patent 7,985,341, filed July 23, 2007 and issued July 26, 2011.

13.  Zhuang, Ming and Walsh, Anthony.  Method for treating acidic waters using recycled acidic and basic sludges. U.S. Patent 7,758,758, filed February 28, 2007 and issued July 20, 2010.

14.  Crowden, John.  Mechanical system for installing and removing contacting devices from a chemical process tower. U.S. Patent 7,572,308, filed September 12, 2005 and issued August 11, 2009.

15.  Zhuang, Ming.  Method for treating metal-contaminated water and soil. U.S. Patent 7,419,605, filed January 19, 2006 and issued September 2, 2008.

16.  Pollock, David.  Circular clarifier apparatus and method. U.S. Patent 7,258,788, filed March 12, 2004 and issued August 21, 2007.

17.  Zhuang, Ming.  Method for removing metals from acid mine drainage. U.S. Patent 7,033,507, filed November 15, 2002 and issued April 25, 2006.

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