Patents Represented by Attorney, Agent or Law Firm Meera P. Narashimhan
  • Loudspeaker system
    Patent number: 6504939
    Abstract: The outer peripheral site of a loudspeaker unit is provided with predetermined air passages formed along substantially the overall inner perimeter of an opening in a baffle plate for allowing a communication between the interior and the exterior of an enclosure, whereby there is provided a loudspeaker system capable of achieving, e.g., improvements in low-frequency characteristics and in transient characteristics while implementing reductions in size and weight.
    Type: Grant
    Filed: May 10, 2000
    Date of Patent: January 7, 2003
    Inventor: Sakuji Fukuda
  • Antireflection coated refractory metal matched emitters for use in thermophotovoltaic generators
    Patent number: 6177628
    Abstract: Thermophotovoltaic (TPV) electric power generators have emitters with infrared (IR) outputs matched with usable wavelengths for converter cells. The emitters have durable substrates, optional refractory isolating layers, conductive refractory metal or inter-metallic emitter layers, and refractory metal oxide antireflection layers. SiC substrates have tungsten or TaSi2 emitter layers and 0.14 micron ZrO2 or Al2O3 antireflection layers used as IR emitters for GaSb converter cells in TPV generators.
    Type: Grant
    Filed: September 28, 1999
    Date of Patent: January 23, 2001
    Assignee: JX Crystals, Inc.
    Inventors: Lewis M. Fraas, Galen Magendanz, James E. Avery