Venting device for tamper resistant electronic modules

Details Venting device for tamper resistant electronic modules Venting device for tamper resistant electronic modules

2007-05-08

2007-05-08

Patel, Dhiru R. (Department: 2831)

Electricity: conductors and insulators

Boxes and housings

C174S0170VA, C174S050510, C361S752000

Reexamination Certificate

active

10981021

ABSTRACT:
A tamper resistant enclosure for an electronic circuit includes an inner copper case, a tamper sensing mesh wrapped around the inner case, an outer copper case enclosing the inner case and the tamper sensing mesh, and a venting device forming a vent channel from inside the inner case to outside the outer case, the vent channel passing between overlapping layers of the tamper sensing mesh and having at least one right angle bend along its length. The venting device includes two strips of a thin polyamide coverlay material laminated together along their length, and a length of wool yarn sandwiched between the two thin strips and extending from one end of the strips to the other end of the strips to form the vent channel. The length of yarn follows a zig-zag path between the first and second strips, the zig-zag path including at least one right angle bend.

REFERENCES:
patent: 5390967 (1995-02-01), Gooderham et al.
patent: 5406630 (1995-04-01), Piosenka et al.
patent: 6412485 (2002-07-01), Saieva
patent: 322515 (1989-07-01), None
IBM U.S. Appl. No. 10/803,632, filed Mar. 18, 2004, Arvind K. Sinha, entitled, “Tamper Proof Card Enclosure for a Circuit Card”.

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