Title:
EMI-ABSORBING AIR FILTER
Document Type and Number:
WIPO Patent Application WO2004032580
Kind Code:
B1
Abstract:
Electromagnetic-energy absorbing materials are used to treat air filters (300), such as those used in association with electronic equipment thereby suppressing the transmission of electromagnetic interference (EMI) therethrough. Disclosed are processes and materials for applying EMI-absorbing materials to air filters thereby improving EMI-shielding effectiveness in an economically efficient manner. In one embodiment, an absorptive solution (110) is prepared using an absorptive material and a binding agent. A heavy coating of absorbing solution is applied (120) to an air filter substrate (100), for example by dipping or spraying. Excess absorbing material is subsequently removed (130) and the absorbing material cured (140), such that the passage of air through the filter remains substantially unimpeded. The resulting absorptive air filter is then optionally treated (160) with a flame retardant to meet a predetermined safety standard.
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Inventors:
JOHNSON RICHARD NORMAN (US)
VAN HAASTER PHILIP (US)
VAN HAASTER PHILIP (US)
Application Number:
PCT/US2003/031119
Publication Date:
July 22, 2004
Filing Date:
October 02, 2003
Export Citation:
Assignee:
LAIRD TECHNOLOGIES INC (US)
JOHNSON RICHARD NORMAN (US)
VAN HAASTER PHILIP (US)
JOHNSON RICHARD NORMAN (US)
VAN HAASTER PHILIP (US)
International Classes:
H05K9/00; (IPC1-7): B01D46/00
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