Patents by Inventor Zhongxin Ma

Zhongxin Ma 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).

  • Process for production of polyasparagine and the high nitrogen content polymer formed thereby
    Patent number: 6562941
    Abstract: A method for the production of polyasparagine is provided wherein the polyasparagine is prepared by ammonolysis of polysuccinimide in liquid ammonia, acting both as a solvent and as a reactant, wherein the polysuccinimide can be any polysuccinimide, such as linear, branched or cross-linked, wherein the polyasparagine produced has high % N content and is neutral as opposed to anionic or cationic.
    Type: Grant
    Filed: August 14, 2001
    Date of Patent: May 13, 2003
    Assignee: Mississippi Chemical Corporation
    Inventor: Zhongxin Ma
  • Process for production of polyasparagine and the high nitrogen content polymer formed thereby
    Publication number: 20020055613
    Abstract: A method for the production of polyasparagine is provided wherein the polyasparagine is prepared by ammonolysis of polysuccinimide in liquid ammonia, acting both as a solvent and as a reactant, wherein the polysuccinimide can be any polysuccinimide, such as linear, branched or cross-linked, wherein the polyasparagine produced has high % N content and is neutral as opposed to anionic or cationic.
    Type: Application
    Filed: August 14, 2001
    Publication date: May 9, 2002
    Applicant: MISSISSIPPI CHEMICAL CORPORATION
    Inventor: Zhongxin Ma
  • Process for production of polyasparagine and the high nitrogen content polymer formed thereby
    Patent number: 6365706
    Abstract: A method for the production of polyasparagine is provided wherein the polyasparagine is prepared by ammonolysis of polysuccinimide in liquid ammonia, acting both as a solvent and as a reactant, wherein the polysuccinimide can be any polysuccinimide, such as linear, branched or cross-linked, wherein the polyasparagine produced has high %N content and is neutral as opposed to anionic or cationic.
    Type: Grant
    Filed: June 21, 2000
    Date of Patent: April 2, 2002
    Assignee: Mississippi Chemical Corporation
    Inventor: Zhongxin Ma