Patents by Inventor John F. Broderick

John F. Broderick has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5576710
    Abstract: An electromagnetic energy absorber provides a base having an electrically conductive ground plane positioned thereover. At least one dielectric and one impedance layer are positioned over the ground plane or surface on a side thereof opposite the base. An external most dielectric skin seals the structure. Additional alternating dielectric and impedance layers can be positioned over the first dielectric and impedance layers. The impedance layer, can be formed from a resistive sheet formed into a broken pattern that can comprise a series of geometric shapes spaced from each other. The broken pattern is sized to vary the specific impedance of the sheet. The resistive sheet can be combined with a series of composite dielectric layers to form an integral composite structure. Three resistive sheet layers can be provided with predetermined spacings from the ground surface and predetermined impedance to effect broadband absorption characteristics.
    Type: Grant
    Filed: June 16, 1994
    Date of Patent: November 19, 1996
    Assignee: Chomerics, Inc.
    Inventors: John F. Broderick, Noel J. Tessier, Michael S. Heafey, Michael T. Kocsik
  • Patent number: 5325094
    Abstract: An electromagnetic energy absorbing structure provides a base structure having an electrically conductive ground plane positioned thereover. At least one dielectric and one impedance layer are positioned over the ground plane or surface on a side thereof opposite the base. An external most dielectric skin seals the structure. Additional alternating dielectric and impedance layers can be positioned over the first dielectric and impedance layers. The dielectric layer can be constructed from syntactic foam with impedance layers formed from patterns of conductive dipoles. The impedance layer, can alternatively, be formed from a resistive sheet formed into a broken pattern that may comprise a series of geometric shapes spaced from each other. The resistive sheet can be combined with a series of composite dielectric layers to form an integral composite structure.
    Type: Grant
    Filed: May 15, 1992
    Date of Patent: June 28, 1994
    Assignee: Chomerics, Inc.
    Inventors: John F. Broderick, Noel J. Tessier, Michael S. Heafey, Michael T. Kocsik
  • Patent number: 5223849
    Abstract: A radar absorbing material comprising multiple layers integrated to form a thin flexible and light weight structure. The material includes a substrate disposed thereon antenna elements that are relatively loaded to enable one to construct a device in relatively small and thin size. The broad handling of the device is carried out by multi-layering concepts in which different size antenna patterns are multi-layered with each layer designed to absorb frequencies in s specified range. The antenna elements are selected for their intrinsic broadband properties and to preferably be polarization insensitive.
    Type: Grant
    Filed: April 11, 1988
    Date of Patent: June 29, 1993
    Assignee: Chomerics, Inc.
    Inventors: Raymond S. Kasevich, John F. Broderick