Patents Represented by Attorney Milton W. Lee

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  • Method of making organic-retina (pyroelectric) vidicon
    Patent number: 4437844
    Abstract: A temporary faceplate is bonded to an assembled (except for retina) vidicon ube. The tube is baked under vacuum pumping at high temperature to cause evaporation or outgassing of contaminants. After cooling, the tube is placed in an inert atmosphere and the temporary faceplate is exchanged for a pyroelectric faceplate. Vacuum is again pumped and the end of the tube containing the electron gun electrodes and the other electrodes is baked for degassing the electrodes. Still under vacuum pumping, the getters and the cathode of the electron gun are heated to activate them, the retina is activated with anode current by applying voltages to the electron gun and the acceleration electrodes by applying focus and sweep fields to the tube, the getters are fired, and the anode current is used to electron beam scrub the retina and other electrodes. Finally, the tube is tipped-off.
    Type: Grant
    Filed: December 30, 1981
    Date of Patent: March 20, 1984
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Ferdinand C. Petito, Gerald Klauber
  • Method of preparing a mercury cadium telluride substrate for passivation and processing
    Patent number: 4436580
    Abstract: A method of preparing a mercury cadmium telluride substrate with a cadmium elluride surface of less than 200 .ANG. to yield a surface exhibiting improved quality and smaller variation in the x-valve of a Hg.sub.1-x Cd.sub.x Te substrate for passivation and processing of the CdTe processed surface. The method comprises the steps of etching said Hg.sub.1-x Cd.sub.x Te substrate with a bromine methanol or bromine-DMF etch, quenching the substrate in methanol or DMF until the bromine is removed and rinsing in acetone and methanol to remove soluble residuals and drying immediately, coating said substrate with CdTe layer of about 1000 .ANG., polishing the processed CdTe layer by a contactless polishing means using a polishing solution of 50% ethylene glycol and 50% mixture of 2% bromine and 98% methanol wherein said CdTe layer is polished down to generally less than 200 .ANG.
    Type: Grant
    Filed: August 12, 1983
    Date of Patent: March 13, 1984
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Phillip R. Boyd, Gary K. Green, Barbara E. Sumner
  • Aiming aid for an aiming device in a low light level environment
    Patent number: 4434560
    Abstract: An aiming aid that shows the orientation of an aiming device, such as hand eld weapons, in a dark environment without being observed by someone at the forward end of the device. The aiming aid is comprised of a very small light source embedded in a milled out hollow section of the weapon barrel which transmits light through the hollow section and a cavity in a front sight to be emitted through a front sight fiber optics pattern only back toward a rear sight. Light from the light source is also transmitted through a rear sight fiber optics pattern, after possibly being transmitted through a light scattering rod positioned on top of the weapon, and is emitted only backward. A shooter aligns the rear and front light patterns to provide the proper aiming of the device.
    Type: Grant
    Filed: February 25, 1983
    Date of Patent: March 6, 1984
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Robert G. Comeyne
  • Method of making rugged vidicon
    Patent number: 4435668
    Abstract: A rugged retina is constructed for a vidicon having a rugged electron gun d other electrodes. The retina is prepared by mounting it between two thin flexible metal or metalized rings with a high viscosity liquid electrode between one of the rings and the retina. This prepared assembly is glued together and onto the vidicon faceplate with a pliant adhesive.
    Type: Grant
    Filed: December 30, 1981
    Date of Patent: March 6, 1984
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Ferdinand C. Petito, Gerald Klauber
  • Free piston displacer control means
    Patent number: 4433550
    Abstract: A free piston displacer control means based on an offset axis mass attached o a crankshaft flywheel in which the rotating crankshaft reciprocates the piston displacer by driving the piston during the momentum of the stroke and by static braking at the end of each stroke at the period of maximum pressure exchange across the cooler frictional seal.
    Type: Grant
    Filed: April 28, 1982
    Date of Patent: February 28, 1984
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Peter Durenec
  • Optical, temporal bandpass filter
    Patent number: 4423927
    Abstract: A twisted nematic liquid crystal optical, temporal bandpass filter device for transmitting optical images only having the time response near a given frequency. The device is comprised of two linear dichroic polarizers with orthogonal polarities at the input and output of the device and two twisted nematic liquid crystal light valves and a relay lens between the light valves. Each of the two light valves has a different time response and has opposite rotary direction handedness of the twist within the nematic liquid crystal cells. That is, the liquid crystal material in the cells is homogeneously aligned with 90.degree. twist between the front and back thin alignment insulator surfaces and the cells have counter untwisting of the polarized light.An a.c.
    Type: Grant
    Filed: September 22, 1981
    Date of Patent: January 3, 1984
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Vincent T. Bly
  • Switchable on-axis optical bandstop filter
    Patent number: 4420217
    Abstract: An optical filter is formed by exposing a photosensitive material to direct nd retroreflected coherent optical radiation. These radiations set up standing waves in the material such that, when the material is fixed, variations in parallel, equally spaced layers of some optical property of the material remain. The optical property may be reflectance, index of refraction, or optical density. The layers are spaced apart one-half wavelength of the coherent radiation and act as an interference filter. The material may be capable of being erased and a new filter formed, if desired.
    Type: Grant
    Filed: December 16, 1982
    Date of Patent: December 13, 1983
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Reinhold Gerharz
  • Method of making a linear light-detecting diode integrated circuit
    Patent number: 4418466
    Abstract: An array for light-detecting diodes is inserted into a cavity in an electally insulating substrate with trimmable resistances on the substrate. The substrate is cooled, the diodes are connected to the resistances and are energized via electrical conductors on the substrate and in the cavity, and their individual near infrared light detectivities are measured. The resistors are trimmed by a laser beam such that all diodes have the same amount of detectivity. The substrate is allowed to return to ambient temperature, is mounted on a cold finger, and electrical conductors are made between the resistance-diode combinations and connectors on the cold finger.
    Type: Grant
    Filed: April 27, 1981
    Date of Patent: December 6, 1983
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: James R. Piedmont, Michael Hacskaylo
  • Means for producing an optimized cooler expander waveform
    Patent number: 4417448
    Abstract: A means for producing an optimized cooler expander waveform for a closed le cryogenic cooler. The cooler displacer is driven by magnetic and spring biasing means through four repeated phases of each cycle to produce four portions of the optimized cooler waveform in which each portion takes up about 25% of the total cycle. The portions are comprised of a constant velocity in opposite direction and dwell times with smoothed corner transitions between each portion. Control means for controlling the displacer movement to produce the specific waveform may be provided by a function generator applying the desired waveform into a displacer control drive circuit which has as a second input a sensory signal of the actual position of the displacer.
    Type: Grant
    Filed: January 20, 1982
    Date of Patent: November 29, 1983
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Stuart B. Horn, Richard A. Wright, Mark S. Asher
  • Cryogenic cooler adapter plate
    Patent number: 4414824
    Abstract: In order to use a common module cryogenic cooler with two different types thermal nights, an adapter plate is required for mounting the cooler to the sights. The plate has its two opposite sides differently machined to fit against the walls of corresponding sights, and has a central opening for a cooler mounting flange. For one sight, one side of the adapter is screwed to the sight wall and the cooler flange is inserted in the central opening. For the other sight, the other side of the adapter is inserted into a recess in the sight wall, and is retained by a retainer plate screwed to the wall. The cooler flange is inserted into the adapter plate central opening through a hole in the retainer plate.
    Type: Grant
    Filed: September 30, 1982
    Date of Patent: November 15, 1983
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Peter Durenec
  • Split-cycle cooler with improved pneumatically-driven cooling head
    Patent number: 4412423
    Abstract: A pneumatic space and an expansion space are provided in a cooling head hng a double-ended piston. A fluid line from the cooler compressor feeds directly into the expansion space, and, via a fluid delay, into the pressure space. In response to the fluid pressure waves in the lines, the piston is first moved in one direction by fluid in the expansion space and in the opposite direction by fluid in the pneumatic space.
    Type: Grant
    Filed: June 16, 1982
    Date of Patent: November 1, 1983
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Peter Durenec
  • Noncontact thermal interface
    Patent number: 4412427
    Abstract: The invention relates to a thermal coupling assembly between the cold fin of a cryogenic cooler and a dewar enclosed detector for use at infrared and far infrared frequencies. The coupling provides excellent thermal coupling without solid or even liquid contact between the cold finger and the detector, so that no strain or vibration is transmitted therebetween.
    Type: Grant
    Filed: November 30, 1981
    Date of Patent: November 1, 1983
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Stuart B. Horn, Lundy H. McMillion, Howard L. Dunmire, Geoffrey S. Sawyer, William C. Gerkin
  • Rotary to recipricating motion translator
    Patent number: 4411164
    Abstract: A yoke with an elliptical slot in it is driven by a reciprocating motion in guide by a circular cam carried off-center to a rotating shaft. The minor axis of the ellipse is equal to the cam diameter and is parallel to the direction of reciprocating motion. The major axis is equal to the cam diameter plus twice the off-center distance of the cam. The yoke may be attached to a piston in a compressor by a connecting rod, or may be formed as a portion of the piston.
    Type: Grant
    Filed: June 2, 1981
    Date of Patent: October 25, 1983
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Peter Durenec, Aubrey J. Dunn
  • Spring loaded piston seal assembly
    Patent number: 4411436
    Abstract: Spring loaded seals comprised of two resting rings positioned in an annular groove of a piston that are pressed against the upper and lower shoulders of the groove by a corrugated spring fitted therebetween. Each resting ring has at least one free-floating sealing wedge, preferably made of ceramic material, which overlaps the outer peripheral edge thereof for sliding along the cylinder wall wherein the sealing wedges frictionally press against the cylinder wall during the stroke of the piston in one direction and release to more freely slide along the cylinder wall in the other direction. The resting rings and sealing wedges form dry seals, i.e. unlubricated sliding seals, for use in compressor devices which operate at either high or low temperatures.
    Type: Grant
    Filed: April 5, 1982
    Date of Patent: October 25, 1983
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Peter Durenec
  • Dual pneumatic volume for cryogenic cooler
    Patent number: 4409793
    Abstract: A dual pneumatic volume means in the ambient end of a free displacer cyroic cooler to provide strong pneumatic braking and dwell times of the displacer movement at both the top dead center and bottom dead center of the displacer waveform. A second pneumatic piston is positioned between the end of the cooler housing and extends into the first pneumatic piston attached to the displacer to form a pneumatic spring volume within the first piston to accomplish the strong pneumatic braking.
    Type: Grant
    Filed: April 19, 1982
    Date of Patent: October 18, 1983
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Peter Durenec
  • Retrofitting a televised output device on a thermal imager
    Patent number: 4407009
    Abstract: An easy retrofitting of a night vision thermal imager to mount a television TV) camera thereon which allows the thermal imager outputs to be viewed remotely by a CRT display. The retrofitting provides a compact and utilitarian remote viewing capability without altering the imager itself. An unpluggable mirror unit, positioned at the output of the imager, provides a folded light path allowing the TV camera to be mounted in an inverted position over the viewer and operate as a remote observation station with the mirror unit attached, or be viewed directly with the mirror unit removed.
    Type: Grant
    Filed: October 27, 1981
    Date of Patent: September 27, 1983
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: James R. Adamson, Jr., Stanley L. Carts, Jr.
  • Prolonged cold temperature cryogenic cooler
    Patent number: 4399661
    Abstract: A cold station thermal switch at the end of a cold finger in cooperation h the detector on an inner dewar wherein the thermal switch opens at the cool down cryogenic temperature to prevent vibrations from the cooler system from being transmitted to the detector. The thermal switch has an outer bellows fitted around the end of the last stage of the cooler which extends close to but not in contact with the detector and an inner bellows having a metallic bumper on the end thereof in contact with the detector until cool down to the operating cryogenic temperature at which time contraction of the inner bellows disconnects the metallic bumper from the detector.
    Type: Grant
    Filed: August 3, 1982
    Date of Patent: August 23, 1983
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Peter Durenec, Steven L. Holt
  • Pseudo-DC restore application to staring array detectors
    Patent number: 4400729
    Abstract: An adjustment signal is derived for each element in a detector array which depends on the median of the differences of image brightness between that particular detector and all its neighboring detectors. The adjustment signal is derived by integrated circuit techniques on the detector itself. The negative feedback of these adjustment signals to the uncorrected detector outputs will delete the salt-and-pepper noise of the staring array.
    Type: Grant
    Filed: December 3, 1980
    Date of Patent: August 23, 1983
    Inventor: George R. Jones
  • Method for removal of LIDAR background backscattering by subtraction of multiple-delayed return signal
    Patent number: 4397549
    Abstract: In certain light detection and ranging (LIDAR) systems it is necessary to move the normal aerosol backscattering signal of the atmosphere so that a weak atmospheric turbulence signal of interest, which is present on the backscattering, may be observed. In this disclosure, only one LIDAR pulse is used wherein the return signal is fed equally into four separate delay lines. The four different delayed signals are subtracted to cancel the background and are amplified to give an output signal for which the background is largely removed while retaining the signal of interest. The signal of interest is then amplified and displayed and/or analyzed.
    Type: Grant
    Filed: March 27, 1981
    Date of Patent: August 9, 1983
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Clifford E. Morgan
  • Cryogenic cooler puller
    Patent number: 4397070
    Abstract: A tool for removing a cryogenic cooler from a dewer-detector. The cooler a flange which mounts onto the dewer through a hole on a large flange to which the dewer is mounted. The tool includes parts for holding the flange fixed with respect to a base plate and parts for attaching to the base of the cooler and moving the cooler with respect to the base.
    Type: Grant
    Filed: March 26, 1982
    Date of Patent: August 9, 1983
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Buford T. Walters