Appeal No. 2003-0553 Page 6
Application No. 09/137,285
USPQ 193, 198 (Fed. Cir. 1983); Kalman v. Kimberly-Clark Corp., 713 F.2d760, 771,
218 USPQ 781, 789 (Fed. Cir. 1983)). "[A]bsence from the reference of any claimed
element negates anticipation." Kloster Speedsteel AB v. Crucible, Inc., 793 F.2d 1565,
1571, 230 USPQ 81, 84 (Fed. Cir. 1986).
Here, Arato discloses "a computer system incorporating an access control
module. . . ." Col. 2, ll. 55-56. The "computer system compris[es] a CPU 10, internal
memory 12, and two peripherals, a printer 14 and a disk drive 16." Col. 3, ll. 4-6. An
I/O channel links the CPU, internal memory, and peripherals. Specifically, "[t]he
CPU 10 communicates with the two peripherals via an I/O channel 18 having address
lines 20 which conduct peripheral address signals, control lines 22 which conduct inter
alia address validation signals, and a data bus 24 which serves to transfer data between
the CPU 10 and the peripherals during read and write operations. The I/O channel 18 is
constituted by a general purpose data bus whose various lines 20, 22, 24 are also used
to address memory locations in the internal memory 12 when the data bus is not being
used in connection with peripheral I/O operations." Col. 3, ll. 7-17. Furthermore, "[a]n
access control module (ACM) 26 is attached to the I/O channel 18 in much the same
manner as are the peripherals 14, 16." Id. at ll. 50-52.
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