Patents by Inventor David M. French

David M. French 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: 9819320
    Abstract: A coaxial amplifier having at least one electron beam is provided. The amplifier may include a conductive rod, a plurality of parallel discs on the rod, a cathode array for producing at least one electron beam. When a plurality of electron beams are formed they are arranged in an annular configuration around said rod and disks, and directed along said rod and coaxially thereof. A first waveguide may apply electromagnetic wave energy to one end of said disc and rod assembly to induce propagation of said energy along said assembly. A second waveguide may extract the amplified electromagnetic energy from the other end of the disc and rod assembly.
    Type: Grant
    Filed: January 24, 2017
    Date of Patent: November 14, 2017
    Assignee: The Government of the United States of America as Represented by the Secretary of the Air Force
    Inventors: Brad W. Hoff, David M. French
  • Patent number: 8841867
    Abstract: A crossed field device, such as a magnetron or crossed field amplifier, that includes a cathode, an anode, one or more magnetic elements, and one or more extraction elements. In one embodiment, the crossed field device includes an annular cathode and anode that are axially spaced from one another such that the device produces an axial electric (E) field and a radial magnetic (B) field. In another embodiment, the crossed field device includes an oval-shaped cathode and anode that are radially spaced from one another such that the device produces a radial electric (E) field and an axial magnetic (B) field. The crossed field device may produce electromagnetic (EM) emissions having a frequency ranging from megahertz (MHz) to terahertz (THz), and may be used in one of a number of different applications.
    Type: Grant
    Filed: August 20, 2010
    Date of Patent: September 23, 2014
    Assignee: The Regents of The University of Michigan
    Inventors: Ronald M. Gilgenbach, Yue-Ying Lau, David M. French, Brad W. Hoff, John Luginsland, Matthew Franzi
  • Patent number: 8766541
    Abstract: A method to modulate the density of an electron beam as it is emitted from a cathode, the method comprised of connecting a source of pulsed input power to the input end of a nonlinear transmission line and connecting the output end directly to the cathode of an electron beam diode by a direct electrical connection.
    Type: Grant
    Filed: September 26, 2011
    Date of Patent: July 1, 2014
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Brad W. Hoff, David M. French, Donald A. Shiffler, Susan L. Heidger, Wilkin W. Tang
  • Publication number: 20110204785
    Abstract: A crossed field device, such as a magnetron or crossed field amplifier, that includes a cathode, an anode, one or more magnetic elements, and one or more extraction elements. In one embodiment, the crossed field device includes an annular cathode and anode that are axially spaced from one another such that the device produces an axial electric (E) field and a radial magnetic (B) field. In another embodiment, the crossed field device includes an oval-shaped cathode and anode that are radially spaced from one another such that the device produces a radial electric (E) field and an axial magnetic (B) field. The crossed field device may produce electromagnetic (EM) emissions having a frequency ranging from megahertz (MHz) to terahertz (THz), and may be used in one of a number of different applications.
    Type: Application
    Filed: August 20, 2010
    Publication date: August 25, 2011
    Applicant: THE REGENTS OF THE UNIVERSITY OF MICHIGAN
    Inventors: Ronald M. Gilgenbach, Yue-Ying Lau, David M. French, Brad W. Hoff, John Luginsland, Matthew Franzi
  • Patent number: 4389265
    Abstract: Processes for reclaiming nitramines from propellants by dissolution of the rosslinked propellant binder by heating the propellant with either (1) a mixture of 2-aminoethanol, an aromatic solvent, and optionally a second low molecular weight alcohol, or (2) a mixture of a mineral acid (HCl, H.sub.2 SO.sub.4, and H.sub.3 PO.sub.4, but not HNO.sub.3), a organic solvent which is acetone, methyl ethyl ketone, ethylene glycol monomethyl ether, tetrahydrofuran, or mixtures thereof, and water.
    Type: Grant
    Filed: July 16, 1981
    Date of Patent: June 21, 1983
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Albert S. Tompa, David M. French, Billy R. White
  • Patent number: 4315830
    Abstract: A method for altering the characteristics of liquid telechelic polymers by means of reducing the reactive group content and adjusting the viscosity of a given liquid telechelic polymer. This is accomplished by means of a two stage process which comprises reacting some of the polymer's available reactive groups with a difunctional reactant and adding a diluent to produce a final composition of desired viscosity and reactive group content.
    Type: Grant
    Filed: January 19, 1972
    Date of Patent: February 16, 1982
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: David M. French, J. T. L. Rosborough, Clyde J. Swedenberg
  • Patent number: 4098627
    Abstract: Pyrotechnic materials containing a crosslinked polymer as a component thef are decomposed by heating to a temperature of about 50.degree. to about 160.degree. C in a liquid medium comprising an active hydrogen containing compound capable of cleaving the chemical bonds contained in said polymer. One or more components of the pyrotechnic material may be separated from the products of the decomposition and reclaimed.
    Type: Grant
    Filed: December 15, 1976
    Date of Patent: July 4, 1978
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Albert S. Tompa, David M. French, George B. Butler, Melvin S. Kaufman