Patents by Inventor Yu-Chih Chiao

Yu-Chih Chiao 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).

  • Separation/recovery of ammonium salts via electrodialytic water splitting
    Patent number: 5228962
    Abstract: The present invention is an improved process for electrodialytically generating salts of volatile acids and/or bases from a salt stream. The salt of the volatile base may either be generated from a similar salt, or may be recovered from a mixed salt solution containing the salt of a volatile base and other similar salts. The salt solution is treated in a two or three compartment electrodialytic water splitter. The acid formed in the acid compartment of the electrodialytic unit is neutralized as it is formed by adding the volatile base directly to the acid loop. Neutralization of the acid in the acid loop minimizes the acid concentration in the electrodialytic unit, thereby increasing the efficiency of the membranes, and the cell stack. The electrodialytic unit may be run in either batch or continuous mode.
    Type: Grant
    Filed: February 1, 1991
    Date of Patent: July 20, 1993
    Assignee: Allied-Signal Inc.
    Inventors: Krishnamurthy N. Mani, Frederick P. Chlanda, Yu-Chih Chiao
  • Method to produce sodium citrate using electrodialysis
    Patent number: 5194130
    Abstract: The present invention relates to a method and an apparatus of electodialytically treating an acid such as citric acid to produce a desired salt of the anion of the acid, such as sodium citrate. A cation can be introduced into a solution via a cheap donor salt solution such as NaCl or KCl, without significantly altering or degrading the purity of the final product. The apparatus comprises a three-compartment cell, which comprises at least two adjacent anion selective membranes to accomplish a cation substitution reaction exploiting the differential selectivities of the adjacent anion membranes employed.
    Type: Grant
    Filed: December 21, 1990
    Date of Patent: March 16, 1993
    Assignee: Allied-Signal Inc.
    Inventors: Carolyn Byszewski, Yu-Chih Chiao
  • Method for purification of acids from materials comprising acid and salt
    Patent number: 5162076
    Abstract: A method of separating acid from an aqueous feed stream comprising acid and salt. The method is conducted in an apparatus comprising a bipolar membrane between at least one first anion membrane and at least one second anion membrane.
    Type: Grant
    Filed: November 30, 1988
    Date of Patent: November 10, 1992
    Assignee: Allied-Signal Inc.
    Inventors: Yu-Chih Chiao, Frederick P. Chlanda, Krishnamurthy N. Mani
  • Method for purification of bases from materials comprising base and salt
    Patent number: 5135626
    Abstract: The present invention is a method of recovery of base from material comprising base or acid and salt. The method is conducted in an apparatus comprising a cation membrane between two bipolar membranes.
    Type: Grant
    Filed: October 15, 1990
    Date of Patent: August 4, 1992
    Assignee: Allied-Signal Inc.
    Inventors: Krishnamurthy N. Mani, Frederick P. Chlanda, Yu-Chih Chiao
  • Method for purification of bases from materials comprising base and salt
    Patent number: 4976838
    Abstract: The present invention is a method of recovery of base from material comprising base or acid and salts. The method is conducted in an apparatus comprising a cation membrane between two bipolar membranes.
    Type: Grant
    Filed: December 1, 1988
    Date of Patent: December 11, 1990
    Assignee: Allied-Signal Inc.
    Inventors: Krishnamurthy N. Mani, Frederick P. Chlanda, Yu-Chih Chiao
  • Recovery of acids from materials comprising acid and salt
    Patent number: 4740281
    Abstract: We have discovered an improved, energy efficient method for recovering and regenerating acid from a solution comprising acid and salt.
    Type: Grant
    Filed: October 14, 1986
    Date of Patent: April 26, 1988
    Assignee: Allied Corporation
    Inventors: Frederick P. Chlanda, Yu-Chih Chiao, Krishnamurthy N. Mani