Patents by Inventor Mark W. Chang

Mark W. Chang 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).

  • Optical cross-connect system
    Patent number: 7183633
    Abstract: An optical cross-connect switch comprises a base (216), a flap (211) and one or more electrically conductive landing pads (222) connected to the flap (211). The flap (211) has a bottom portion that is movably coupled to the base (216) such that the flap (211) is movable with respect to a plane of the base (216) from a first orientation to a second orientation. The one or more landing pads (222) are electrically isolated from the flap (211) and electrically coupled to be equipotential with a landing surface.
    Type: Grant
    Filed: March 1, 2002
    Date of Patent: February 27, 2007
    Assignee: Analog Devices Inc.
    Inventors: Michael J. Daneman, Franklin Wall, Behrang Behin, Murali Chaparala, Mark W. Chang, Scott Dalton, Timothy Beerling, Stephen Panyko, Meng-Hsiung Kiang, Boris Kobrin, Chuang-Chia Lin
  • Maintaining the state of a MEMS device in the event of a power failure
    Patent number: 6514781
    Abstract: A method and apparatus for maintaining the state of a MEMS device in the event of a power failure are disclosed. The apparatus and method may be used with a MEMS device generally having one or more MEMS elements moveably coupled to a substrate that uses electrostatic clamping force to sustain the state of the MEMS element. According to the method, a capacitive or other charge-storing circuit is coupled between a clamping surface and an electrical ground. During normal operation, a clamping voltage is applied between the clamping surface and at least one MEMS element to retain the at least one MEMS element against the clamping surface. In the event of a power failure, the source of the clamping voltage and other circuit paths to ground are isolated from the clamping surface. The charge-storing circuit maintains an electric charge on the clamping surface.
    Type: Grant
    Filed: July 7, 2001
    Date of Patent: February 4, 2003
    Assignee: Onix Microsystems, Inc.
    Inventors: Mark W. Chang, Scott D. Dalton, Michael J. Daneman, Timothy Beerling, Stephen F. Panyko, Gary M. Zalewski
  • MAINTAINING THE STATE OF A MEMS DEVICE IN THE EVENT OF A POWER FAILURE
    Publication number: 20030008420
    Abstract: A method and apparatus for maintaining the state of a MEMS device in the event of a power failure are disclosed. The apparatus and method may be used with a MEMS device generally having one or more MEMS elements moveably coupled to a substrate that uses electrostatic clamping force to sustain the state of the MEMS element. According to the method, a capacitive or other charge-storing circuit is coupled between a clamping surface and an electrical ground. During normal operation, a clamping voltage is applied between the clamping surface and at least one MEMS element to retain the at least one MEMS element against the clamping surface. In the event of a power failure, the source of the clamping voltage and other circuit paths to ground are isolated from the clamping surface. The charge-storing circuit maintains an electric charge on the clamping surface.
    Type: Application
    Filed: July 7, 2001
    Publication date: January 9, 2003
    Inventors: Mark W. Chang, Scott D. Dalton, Michael J. Daneman, Timothy Beerling, Stephen F. Panyko, Gary M. Zalewski