Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel
Reexamination Certificate
2008-07-01
2008-07-01
Shalwala, Bipin (Department: 2629)
Computer graphics processing and selective visual display system
Display peripheral interface input device
Touch panel
C345S156000, C345S174000, C178S018060, C178S019040, C341S033000, C361S600000, C361S736000, C361S761000
Reexamination Certificate
active
07394458
ABSTRACT:
A printed circuit board (PCB) assembly provides a two layer capacitive trackpad sensor in which an EMI ground grid is interposed among the sensor's capacitive elements on each of its layers. The EMI grid on each of the two layers is electrically coupled via, typically, vias. The described arrangement of sensor elements (capacitor plates) and EMI ground grid traces may be incorporated into a PCB having additional layers (e.g., a four, six or eight layer PCB). If used in this manner, additional vias are provided on the PCB which permit electrical coupling between these “additional layers” and which are electrically isolated from, and shielded by, the EMI ground grid.
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patent: 2004/0041185 (2004-03-01), Ireland
US Patent Application entitled Hybrid Ground Grid for Printed Circuit Board by Robert Steinfeld and Cheung-Wei Lam. U.S. Appl. No. 10/774,053, filed Feb. 5, 2004.
Hotelling Steven P.
Lyon Benjamin
Apple Inc.
Kovalick Vince E
Shalwala Bipin
Wong, Cabello, Lutsch, Rutherford & Brucculeri L.L.P.
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