Electrically gradated carbon foam

Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having voids in a component

Reexamination Certificate

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C264S405000, C264S029100, C264S029700

Reexamination Certificate

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07867608

ABSTRACT:
Electrically gradated carbon foam materials that have changing or differing electrical properties through the thickness of the carbon foam material and methods for making these electrically gradated carbon foam materials are described herein. In some embodiments, the electrically gradated carbon foam materials exhibit increasing electrical resistivity through the thickness of the carbon foam material such that the electrical resistivity near a second surface of the carbon foam is at least 2 times greater than the electrical resistivity near a first surface of the carbon foam. These electrically gradated carbon foam materials may be used as radar absorbers, as well as in electromagnetic interference (EMI) shielding schemes.

REFERENCES:
patent: 3302999 (1967-02-01), Mitchell et al.
patent: 3484391 (1969-12-01), Rains et al.
patent: 4133738 (1979-01-01), Will
patent: 4442165 (1984-04-01), Gebhardt et al.
patent: 7247368 (2007-07-01), Rogers
patent: 2004/0191632 (2004-09-01), Kelley et al.

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