Patents by Inventor Paul M. Gammell

Paul M. Gammell 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: 5532589
    Abstract: A magnetic field generator positioned externally of a non-ferrous metallic tructure being examined, is rotated at a relatively low speed to produce a rotating magnetic field penetrating the metallic structure to a selected depth as a function of spacing between magnetic poles of the generator parallel to a planar surface of the metallic structure. Traction between the metallic structure and the magnetic field accompanying its rotation is measured. Corrosion of the metallic structure at subsurface depths is detected and quantified from such traction measurements.
    Type: Grant
    Filed: May 24, 1995
    Date of Patent: July 2, 1996
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Paul M. Gammell
  • Patent number: 5436565
    Abstract: Conductive measuring electrodes, of a capacitive probe having a grounded rd electrode positioned therebetween shield a probe circuit, provides mutual capacitance measurements which way as a function of changes in impedance of dielectric material being monitored as it undergoes a curing process. The probe is positioned in non-embedded relation to the dielectric material to form a sensitivity region therein through which an electric field extends between the conductive measuring electrodes of the probe to establish said variable mutual capacitance measurements without extraneous influences.
    Type: Grant
    Filed: September 14, 1992
    Date of Patent: July 25, 1995
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Paul M. Gammell
  • Patent number: 5088327
    Abstract: Acoustical radiation is generated and applied to the bonding interface between a radiation transmission material and a radiation attenuating material to determine adhesion quality by extraction of data from a response signal produced by echoes reflected from both the interface and the radiation entry surface on the radiation transmissive material exposed to the generated acoustical radiation. Signal phase cancellation between the echoes from the entry surface and bonding interface produce a signal signature from which the quality of bonding is evaluated. By partial attenuation of the echo from the entry surface, the signature is maximized.
    Type: Grant
    Filed: May 17, 1990
    Date of Patent: February 18, 1992
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Paul M. Gammell
  • Patent number: 5021738
    Abstract: A compound eddy current probe comprising a nest of concentric ferrite cup re probes. Both the inner and outer radii of the activated coil can be selectively altered by operator or automatic program to correspond with the size and thickness of the material under test.
    Type: Grant
    Filed: March 26, 1990
    Date of Patent: June 4, 1991
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Susan N. Vernon, Brian Sircus, Paul M. Gammell
  • Patent number: 4924182
    Abstract: This invention relates to a method for nondestructive inspection (NDI) of mposite materials comprising conductive fibers. The depth of broken fiber damage in nonmetal matrix composites such as graphite/epoxy and carbon/carbon materials may be ascertained and eddy current inspection is extended to include thick metal sections by this method. Inspection is possible with access limited to a single surface.
    Type: Grant
    Filed: January 9, 1989
    Date of Patent: May 8, 1990
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Susan N. Vernon, Paul M. Gammell
  • Patent number: 4922201
    Abstract: This invention relates to a method and device for measuring the resistivity f materials. In particular, the methods measure resistivity in carbon fiber reinforced composites as well as any materials with a relative magnetic permeability of 1. The measurement may be made with access restricted to a single side of the material under test.
    Type: Grant
    Filed: January 9, 1989
    Date of Patent: May 1, 1990
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Susan N. Vernon, Paul M. Gammell
  • Patent number: 4837578
    Abstract: A method and apparatus for use in a pulse-echo imaging or ranging system comprising means (32) for identifying the analytic signal from a received signal and means (34) for extracting ranging information from the analytic signal. The analytic signal can be obtained and processed by digital or by analog circuit means. One embodiment of the analog circuit means (32) includes means (90) for modulating the received signal on a carrier frequency, means (92) for obtaining a single sideband signal from the modulated signal and means (94) for envelope detecting the single sideband signal.
    Type: Grant
    Filed: October 29, 1981
    Date of Patent: June 6, 1989
    Assignee: California Institute of Technology
    Inventor: Paul M. Gammell
  • Patent number: 4346715
    Abstract: The present invention is an improved array of electrodes for use in delivering electromagnetic energy to a localized area of a patient's body in a hyperthermic treatment so that it provides a uniform distribution of electromagnetic flux lines within the localized area of the patient's body in order to produce a uniform and localized heating gradient. The improved array of electrodes includes a plurality of electrodes which are arranged in pair, with the electrodes in each pair being spaced a particular distance apart. The improved array of electrodes are driven by a balanced line system which is electromagnetically coupled to each pair of electrodes and which is shielded by a ground coaxial shield which itself is ground to the body of the patient. Each electrode is embedded in a Teflon stand-off in order to move the region of strong field, from the body, produced by rapidly changing potentials. The two pairs of electrodes forming a cross like geometry are used with the balanced line systems.
    Type: Grant
    Filed: May 13, 1980
    Date of Patent: August 31, 1982
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventor: Paul M. Gammell