1
Howard D Haynes, David M Eissenberg: Motor current signature analysis method for diagnosing motor operated devices. Martin Marietta Energy Systems, J M Spicer, Bruce M Winchell, October 23, 1990: US04965513 (91 worldwide citation)

A motor current noise signature analysis method and apparatus for remotely monitoring the operating characteristics of an electric motor-operated device such as a motor-operated valve. Frequency domain signal analysis techniques are applied to a conditioned motor current signal to distinctly identif ...


2
Arvid C Johnson, Robert J Lauf, Don W Bible, Robert J Markunas: Apparatus and method for microwave processing of materials. Martin Marietta Energy Systems, Jeffrey N Cutler, J M Spicer, H W Adams, May 28, 1996: US05521360 (88 worldwide citation)

A variable frequency microwave heating apparatus (10) designed to allow modulation of the frequency of the microwaves introduced into a furnace cavity (34) for testing or other selected applications. The variable frequency heating apparatus (10) is used in the method of the present invention to moni ...


3
John C Moyers, Howard D Haynes: Method and apparatus for monitoring armature position in direct-current solenoids. Martin Marietta Energy Systems, E A Pennington, J M Spicer, H W Adams, December 10, 1996: US05583434 (70 worldwide citation)

A method for determining the position of an armature of a dc-powered solenoid. Electrical circuitry is provided to introduce a small alternating current flow through the coil. As a result, the impedance and resistance of the solenoid coil can be measured to provide information indicative of the arma ...


4
Stephen F Smith, Kimberly N Castleberry: Method and apparatus for monitoring machine performance. Martin Marietta Energy Systems, E A Pennington, J M Spicer, H W Adams, June 4, 1996: US05523701 (39 worldwide citation)

Machine operating conditions can be monitored by analyzing, in either the time or frequency domain, the spectral components of the motor current. Changes in the electric background noise, induced by mechanical variations in the machine, are correlated to changes in the operating parameters of the ma ...


5
Vladimir A Protopopescu, Robert T Santoro, Johnny S Tolliver: Fast and secure encryption-decryption method based on chaotic dynamics. Martin Marietta Energy Systems, E A Pennington, J M Spicer, H W Adams, December 26, 1995: US05479513 (28 worldwide citation)

A method and system for the secure encryption of information. The method comprises the steps of dividing a message of length L into its character components; generating m chaotic iterates from m independent chaotic maps; producing an "initial" value based upon the m chaotic iterates; transforming th ...


6
Donald A Casada, Howard D Haynes, John C Moyers, Brian K Stewart: Method and system for measuring gate valve clearances and seating force. Lockheed Martin Energy Systems, E A Pennington, J M Spicer, H W Adams, January 30, 1996: US05487302 (17 worldwide citation)

Valve clearances and seating force, as well as other valve operational parameters, are determined by measuring valve stem rotation during opening and closing operations of a translatable gate valve. The magnitude of the stem rotation, and the relative difference between the stem rotation on opening ...


7
Larry M Dickens, Howard D Haynes, Curtis W Ayers: Method and apparatus for monitoring aircraft components. Martin Marietta Energy Systems, E A Pennington, J M Spicer, H W Adams, January 16, 1996: US05483833 (10 worldwide citation)

Operability of aircraft mechanical components is monitored by analyzing the voltage output of an electrical generator of the aircraft. Alternative generators, for a turbine-driven rotor aircraft, include the gas producer turbine tachometer generator, the power turbine tachometer generator, and the a ...


8
Gerald D Alton: Microwave electron cyclotron electron resonance (ECR) ion source with a large, uniformly distributed, axially symmetric, ECR plasma volume. Martin Marietta Energy Systems, E A Pennington, J M Spicer, H W Adams, April 9, 1996: US05506475 (9 worldwide citation)

An electron cyclotron resonance (ECR) ion source includes a primary mirror coil disposed coaxially around a vacuum vessel in which a plasma is induced and introducing a solenoidal ECR-producing field throughout the length of the vacuum vessel. Radial plasma confinement is provided by a multi-cusp, m ...


9
Carsten M Haaland: Double-duct liquid metal magnetohydrodynamic engine. Martin Marietta Energy Systems, E A Pennington, J M Spicer, H W Adams, December 5, 1995: US05473205 (8 worldwide citation)

An internal combustion, liquid metal (LM) magnetohydrodynamic (MHD) engine and an alternating current (AC) magnetohydrodynamic generator, are used in combination to provide useful AC electric energy output. The engine design has-four pistons and a double duct configuration, with each duct containing ...


10
Donald A Casada: Method and apparatus for monitoring motor operated valve motor output torque and power at valve seating. Martin Marietta Energy Systems, E A Pennington, J M Spicer, H W Adams, January 16, 1996: US05483841 (7 worldwide citation)

A method and apparatus are provided for monitoring a motor operated valve during the brief period when the valve seats and the torque switch trips to deenergize the valve motor. The method uses voltage measurements on the load side of a deenergizing switch that opens to deenergize the motor to deter ...