Patents by Inventor Andrew W. Wang

Andrew W. Wang 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).

  • Transition metal salt impregnated carbon
    Patent number: 5540759
    Abstract: The present invention is a synthesis, product and process for activated carbon and preferably carbon molecular sieve separation of air to produce a nitrogen product wherein a carbon is partially pyrolyzed, impregnated with a transition metal salt and further pyrolyzed to develop enhanced microporosity. The resulting microporous carbon can then be activated with carbon dioxide or steam and then pore-sized by cracking of hydrocarbons on the carbon to produce a carbon molecular sieve.
    Type: Grant
    Filed: February 15, 1995
    Date of Patent: July 30, 1996
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Timothy C. Golden, Andrew W. Wang, James F. Sciple
  • Transition metal salt impregnated carbon
    Patent number: 5482915
    Abstract: The present invention is a synthesis, product and process for activated carbon and preferably carbon molecular sieve separation of air to produce a nitrogen product wherein a carbon is partially pyrolyzed, impregnated with a transition metal salt and further pyrolyzed to develop enhanced microporosity. The resulting microporous carbon can then be activated with carbon dioxide or steam and then pore-sized by cracking of hydrocarbons on the carbon to produce a carbon molecular sieve.
    Type: Grant
    Filed: September 20, 1993
    Date of Patent: January 9, 1996
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Timothy C. Golden, Andrew W. Wang, James F. Sciple
  • High purity nitrogen PSA utilizing controlled internal flows
    Patent number: 5441558
    Abstract: The present invention is a nitrogen pressure swing adsorption process for separating gas mixtures containing nitrogen and oxygen, such as air, using a unique gas transfer process step, continuous feed gas introduction and an appropriate isolation step with continued product purge/repressurization to achieve high purity nitrogen product of 99.9% or greater by volume nitrogen, preferably 99.99% or greater by volume of nitrogen.
    Type: Grant
    Filed: August 9, 1994
    Date of Patent: August 15, 1995
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Sang K. Lee, Andrew W. Wang, Robert Paul