Changgu Lee

US Patent:

8418547, Apr 16, 2013

Filed:

Aug 6, 2009

Appl. No.:

13/057701

Inventors:

Jeffrey William Kysar - New York NY, US
James C. Hone - New York NY, US
Changgu Lee - New York NY, US
Xiaoding Wei - New York NY, US

Assignee:

The Trustees of Columbia University in the City of New York - New York NY

International Classification:

G01L 5/04
G01L 7/08

US Classification:

73159, 73715

Abstract:

Force, pressure, or stiffness measurement or calibration can be provided, such as by using a graphene or other sheet membrane, which can provide a specified number of monolayers suspended over a substantially circular well. In an example, the apparatus can include a substrate, including a substantially circular well. A deformable sheet membrane can be suspended over the well. The membrane can be configured to include a specified integer number of one or more monolayers. A storage medium can comprise accompanying information about the suspended membrane or the substrate that, with a deflection displacement response of the suspended membrane to an applied force or pressure, provides a measurement of the applied force or pressure.

US Patent:

20060010871, Jan 19, 2006

Filed:

Nov 15, 2004

Appl. No.:

10/988974

Inventors:

Luc Frechette - Fleurimont, CA
Norbert Muller - Haslett MI, US
Changgu Lee - New York NY, US

Assignee:

THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK - New York NY

International Classification:

F01K 23/06

US Classification:

060670000

Abstract:

In accordance with the present invention, an integrated micro steam turbine power plant on-a-chip has been provided. The integrated micro steam turbine power plant on-a-chip of the present invention comprises a miniature electric power generation system fabricated using silicon microfabrication technology and lithographic patterning. The present invention converts heat to electricity by implementing a thermodynamic power cycle on a chip. The steam turbine power plant on-a-chip generally comprises a turbine, a pump, an electric generator, an evaporator, and a condenser. The turbine is formed by a rotatable, disk-shaped rotor having a plurality of rotor blades disposed thereon and a plurality of stator blades. The plurality of stator blades are interdigitated with the plurality of rotor blades to form the turbine. The generator is driven by the turbine and converts mechanical energy into electrical energy.