Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Noninterengaged fiber-containing paper-free web or sheet...
Patent
1986-05-05
1988-02-16
Cannon, James C.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Noninterengaged fiber-containing paper-free web or sheet...
244121, 244133, 252 6254, 252 6256, 252 6262, 252 6263, 252 6264, 333 21A, 333 21R, 342 1, 342 2, 342 3, 342 5, 342 6, 343756, 343897, 343909, 428293, 428294, 428302, 428329, 428697, 428701, B65D 4500, H01Q 1524, H01Q 1700, H03C 700, H05K 900
Patent
active
047254904
ABSTRACT:
High magnetic permeability composites are obtained by incorporating ferrite fibers in the composites. The ferrite fibers consist of a polymer and particulate ferrite fill at a concentration above the percolation threshold for the ferrite fill in the polymer (typically greater than 30 volume percent). The aspect ratio and ferrite concentration of the fibers are selected to minimize demagnetization fields in the fibers. The fibers can be dispersed in low concentration in an unoriented fashion in the composites to impart high magnetic permeability to the composite. In other embodiments, the fibers are oriented in the composites to impart high magnetic permeability to the composite for incident radiation of a particular linear polarization.
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British Intelligence Objectives Sub-Committee Final Report No. 869, Item No. 1, "Ferromagnetic Material For Radar Absorption", declassified Apr. 26, 1960.
Cannon James C.
Hoechst Celanese Corporation
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