Research/Patents/US 5561428
US 5561428

ELECTROMAGNETIC RADIATION ABSORBER AND METHOD FOR THE PRODUCTION THEREOF

Assignee

DEPOSITION TECHNOLOGY, INC.

Filed

Feb 12, 1985

Granted

Oct 1, 1996

Location

San Diego CA (SAIC/General Dynamics)

Abstract

Disclosed herein is an electromagnetic radiation absorber comprising a filamentary, three-dimensional, porous substrate of dielectric material having a relatively thin layer of electrically conductive material deposited thereupon. The layer is characterized by a generally gradual and continuous reduction in its thickness or bulk with inward progression into the substrate from one side thereof, thus resulting in a layer exhibiting a graduated resistivity. A filler substantially pervious to the radiation of interest may be disposed in the interstitial voids between filaments, and relatively small diameter magnetic/magnetizeable particles may be suspended in the filler to thereby further extend the useful frequency range of the absorber. Also disclosed is a sputtering method for producing such an absorber.

Source: Google Patents

35 USC §181 Secrecy Order

Imposed

Jul 30, 1985

Rescinded

Jul 13, 1995

Duration

9 years, 11 months

Inventor

  • 1STAN CZAJA

Sensitive facility: San Diego CA (SAIC/General Dynamics)

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Back to patent indexSource: USPTO 35 USC §181 secrecy order records