Patents by Inventor Terrence F. Yee

Terrence F. Yee 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).

  • Vaporization of liquid oxygen for increased argon recovery
    Patent number: 5255522
    Abstract: The present invention relates to an improvement for the production of argon from cyrogenic air separation processes. In particular, the improvement comprises satisfying a portion of the crude argon column condensing duty with refrigeration provided from the vaporization of a portion of the liquid oxygen from the bottom of the low pressure column.
    Type: Grant
    Filed: February 13, 1992
    Date of Patent: October 26, 1993
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Rakesh Agrawal, Terrence F. Yee
  • Dual heat pump cycles for increased argon recovery
    Patent number: 5255524
    Abstract: The present invention relates to an improvement for the production of argon from cryogenic air separation processes. In particular, the improvement comprises using a first heat pump cycle to transfer refrigeration from the bottom of the low pressure column to the top of the crude argon column and a second heat pump cycle to transfer refrigeration from the bottom of the low pressure column to the top of the low pressure column.
    Type: Grant
    Filed: February 13, 1992
    Date of Patent: October 26, 1993
    Assignee: Air Products & Chemicals, Inc.
    Inventors: Rakesh Agrawal, Terrence F. Yee
  • Single heat pump cycle for increased argon recovery
    Patent number: 5245831
    Abstract: The present invention relates to an improvement for the production of argon from cryogenic air separation processes. In particular, the improvement comprises using a heat pump cycle to transfer refrigeration from the bottom of the low pressure column to the top of the crude argon column wherein the heat pump cycle employs a heat pump fluid having a nitrogen content equal to or greater than the feed air.
    Type: Grant
    Filed: February 13, 1992
    Date of Patent: September 21, 1993
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Rakesh Agrawal, Terrence F. Yee
  • Composite mixed conductor membranes for producing oxygen
    Patent number: 5240480
    Abstract: The present invention relates to novel multi-layer composite solid state membranes which are capable of separating oxygen from oxygen-containing gaseous mixtures at elevated temperatures. The membranes comprise a multicomponent metallic oxide porous layer having an average pore radius of less than about 10 micrometers and a multicomponent metallic oxide dense layer having no connected through porosity wherein the porous and dense layers are contiguous and such layers conduct electrons and oxygen ions at operating temperatures.
    Type: Grant
    Filed: September 15, 1992
    Date of Patent: August 31, 1993
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Robert M. Thorogood, Rajagopalan Srinivasan, Terrence F. Yee, Miles P. Drake