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:
Sep. 28, 2004
Filed:
Jun. 13, 2002
John J. Holmes, Columbia, MD (US);
John F. Scarzello, Columbia, MD (US);
The United States of America as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
The electromagnetic field produced by an electrical device is electromagnetically canceled by a three-dimensional configuration of electrical coils which together provide a box-like enclosure having at least six sides/faces. The electromagnetic containment of the electromagnetic field is effected via the physical occurrence of zero magnetic flux perpendicularly through each side/face. At least one coil is positioned in correspondence with each side/face of the box-like enclosure. Each coil has a set of conductors divided into two halves in terms of circuitry, the conductors in each half being connected to each other in series. With regard to each coil, a first amplifier receives an electrical signal from the first conductor half and outputs to a second amplifier a voltage signal proportional to the AC magnetic flux through the coil. The second amplifier inputs a current signal to the second conductor half so as to render nonexistent the first amplifier's output voltage signal.