The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 16, 2000
Filed:
Mar. 14, 1997
Donald L Purinton, Plano, TX (US);
Oren B Kesler, Plano, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A device and method of making the device for regulating electromagnetic radiations in a predetermined frequency range, which comprises a substrate and a coating mixture on a surface of the substrate. The coating mixture is provided by mixing together: (a) a plurality of flakes of a magnetic or ferrite material having substantial length and width dimensions relative to their thickness, the thickness of substantially all of the flakes being less than the skin depth of all frequencies in the predetermined frequency range, (b) at least one surfactant, (c)) a vaporizable electrically insulating material and (d) a solvent. The mixture is sprayed onto the surface of the substrate, either with or without a magnetic field at the surface, and the solvent is removed to retain the flakes on the substrate spaced from each other by the electrically insulating material and disposed substantially parallel to the portion of the plane of the surface thereunder. The substrate can be any one of at least an automobile, an aircraft, an electronic enclosure, a portion of a building, a tower causing electromagnetic interference or a location for placement of an antenna. The device is preferably an absorber for electromagnetic radiations, particularly for use on the surfaces of a mobile device such as an automobile, aircraft or personal electronic device. The flakes are any magnetic or ferrite material than can be provided in flake form in the thickness range required.