Patents by Inventor Sang-Joon J. Lee

Sang-Joon J. Lee 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).

  • Fuel cell with patterned electrolyte/electrode interface
    Patent number: 6835488
    Abstract: A fuel cell contains an electrolyte sheet sandwiched between two electrodes. One or both electrode/electrolyte interfaces includes mesoscopic three-dimensional features in a prescribed pattern. The features increase the surface area-to-volume ratio of the device and can be used as integral channels for directing the flow of reactant gases to the reaction surface area, eliminating the need for channels in sealing plates surrounding the electrodes. The electrolyte can be made by micromachining techniques that allow very precise feature definition. Both selective removal and mold-filling techniques can be used. The fuel cell provides significantly enhanced volumetric power density when compared with conventional fuel cells.
    Type: Grant
    Filed: May 8, 2001
    Date of Patent: December 28, 2004
    Assignees: Honda Giken Kogyo Kabushiki Kaisha, Stanford University
    Inventors: Jun Sasahara, Suk Won Cha, Amy Chang-Chien, Tadahiro Kubota, Nariaki Kuriyama, Sang-Joon J. Lee, Yaocheng Liu, Ryan O'Hayre, Friedrich B. Prinz, Yuji Saito
  • Fuel cell with patterned electrolyte/electrode interface
    Publication number: 20020012825
    Abstract: A fuel cell contains an electrolyte sheet sandwiched between two electrodes. One or both electrode/electrolyte interfaces includes mesoscopic three-dimensional features in a prescribed pattern. The features increase the surface area-to-volume ratio of the device and can be used as integral channels for directing the flow of reactant gases to the reaction surface area, eliminating the need for channels in sealing plates surrounding the electrodes. The electrolyte can be made by micromachining techniques that allow very precise feature definition. Both selective removal and mold-filling techniques can be used. The fuel cell provides significantly enhanced volumetric power density when compared with conventional fuel cells.
    Type: Application
    Filed: May 8, 2001
    Publication date: January 31, 2002
    Inventors: Jun Sasahara, Suk Won Cha, Amy Chang-Chien, Tadahiro Kubota, Nariaki Kuriyama, Sang-Joon J. Lee, Yaocheng Liu, Ryan O'Hayre, Friedrich B. Prinz, Yuji Saito
  • Three-dimensional printing techniques
    Patent number: 5387380
    Abstract: A process for making a component by depositing a first layer of a powder material in a confined region and then depositing a binder material to selected regions of the layer of powder material to produce a layer of bonded powder material at the selected regions. Such steps are repeated a selected number of times to produce successive layers of selected regions of bonded powder material so as to form the desired component. The unbonded powder material is then removed. In some cases the component may be further processed as, for example, by heating it to further strengthen the bonding thereof.
    Type: Grant
    Filed: June 5, 1992
    Date of Patent: February 7, 1995
    Assignee: Massachusetts Institute of Technology
    Inventors: Michael Cima, Emanuel Sachs, Tailin Fan, James F. Bredt, Steven P. Michaels, Satbir Khanuja, Alan Lauder, Sang-Joon J. Lee, David Brancazio, Alain Curodeau, Harald Tuerck