Patents by Inventor Daniel Edward Walsh

Daniel Edward Walsh 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 of producing gold nanoparticle
    Patent number: 7060121
    Abstract: A method for producing gold nanoparticles is disclosed. When gold salt solution is mixed with an adsorbent, gold in the form of complexes is adsorbed onto the surface of the adsorbent. The gold-loaded adsorbent, after being separated from the solution by screening, filtration, settling or other methods, is ashed to form ashes. The ashes contain gold nanoparticles and impurities such as oxides of sodium, potassium and calcium. The impurities can be removed by dissolution using dilute acids. The relatively pure gold nanoparticles are obtained after the impurities are removed. Activated carbon or gold-adsorbing resin can be used as the adsorbent. Silver or platinum group metal nanoparticles can also be produced by this method.
    Type: Grant
    Filed: June 25, 2003
    Date of Patent: June 13, 2006
    Inventors: Hsing Kuang Lin, Daniel Edward Walsh
  • Method of producing gold nanoparticle
    Publication number: 20040261574
    Abstract: A method for producing gold nanoparticles is disclosed. When gold salt solution is mixed with an absorbent, gold in the form of complexes is adsorbed onto the surface of the absorbent. The gold-loaded absorbent, after being separated from the solution by screening, filtration, settling or other methods, is ashed to form ashes. The ashes contain gold nanoparticles and impurities such as oxides of sodium, potassium and calcium. The impurities can be removed by dissolution using dilute acids. The relatively pure gold nanoparticles are obtained after the impurities are removed. Activated carbon or gold-adsorbing resin can be used as the absorbent. Silver or platinum group metal nanoparticles can also be produced by this method.
    Type: Application
    Filed: June 25, 2003
    Publication date: December 30, 2004
    Inventors: Hsing Kuang Lin, Daniel Edward Walsh