Patents by Inventor E Nam Hwang

E Nam Hwang 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).

  • Method for production of l-phenylalanine by Echerichia coli mutant that is resistant to osmotic pressure
    Patent number: 5409830
    Abstract: A novel E. coli strain which can produce L-phenylalanine and is resistant to high osmotic pressure and a process for producing L-phenylalanine by use of the novel E. coli (KCCM 10,016) are disclosed.
    Type: Grant
    Filed: June 21, 1994
    Date of Patent: April 25, 1995
    Assignee: Miwon Co. Ltd.
    Inventors: Byung L. Lim, Hong Rhym, Jin H. Lee, Tae Y. Choi, E. Nam Hwang, Hong K. Choi
  • Process for producing .alpha.-L-aspartyl-L-phenylalanine methyl ester
    Patent number: 5334746
    Abstract: A process for the preparation of .alpha.-L-aspartyl-L-phenylalanine methyl ester in high yield, which comprises the steps of esterifying L-phenylalanine with methanol while undergoing continuous evaporation to remove the water formed during esterification, coupling the produced L-phenylalanine methyl ester with N-formyl-L-aspartic anhydride, deformylating the produced N-formyl-L-aspartyl-L-phenylalanine methyl ester, crystallizing the formed .alpha.-L-aspartyl-L-phenylalanine methyl ester as .alpha.-L-aspartyl-L-phenylalanine methyl ester hydrochloric acid salt, recovering the first .alpha.-L-aspartyl-L-phenylalanine methyl ester hydrochloric acid salt, esterifying .alpha.-L-aspartyl-L-phenylalanine in the filtrate to produce the second .alpha.-L-aspartyl-L-phenylalanine methyl ester, and combining the first and second .alpha.-L-aspartyl-L-phenylalanine methyl ester product.
    Type: Grant
    Filed: December 6, 1993
    Date of Patent: August 2, 1994
    Assignee: Miwon Co., Ltd.
    Inventors: Kyung S. Choi, Dae K. Joo, Min S. Han, E Nam Hwang, Hong K. Choi