Patents by Inventor Jun S. Choe

Jun S. Choe 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).

  • Membrane-assisted process to produce ammonia
    Patent number: 5455016
    Abstract: A membrane-assisted process to produce ammonia is set forth wherein the recycle stream from the ammonia process containing primarily unreacted hydrogen and nitrogen but also containing inerts and unrecovered ammonia is separated in a first ammonia-selective membrane separator into a permeate stream enriched in ammonia and a non-permeate stream enriched in hydrogen, nitrogen and the inerts which is recycled to the reactor feed. A key to the present invention is that the permeate stream enriched in ammonia is recycled to the reactor effluent.
    Type: Grant
    Filed: August 31, 1994
    Date of Patent: October 3, 1995
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Jun S. Choe, Lyndon J. Kellogg, Jr.