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"I watched his countenance closely, to see if he was not deranged ... and I was assured by other senators after he left the room that they had no confidence in it."
U.S. Senator Smith of Indiana ; After seeing Samuel Morse demonstrate the telegraph.
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| Number | Title | Issue Date |
| 6380097 | Method for obtaining a sulfur-passivated semiconductor surface An aqueous thiourea-ammonia treatment is used to form a thin sulfurous film at the indium phosphide surface, having a thickness of less than one nanometer. The thiourea-ammonium hydroxide treatment can be used as is or immediately prior to deposition of c... | 04/30/2002 |
| 6154475 | Silicon-based strain-symmetrized GE-SI quantum lasers A family of lasers is provided which can be readily grown upon silicon wafer platforms, each laser having a highly doped stably strained SiGe or Ge collector layer formed upon a SiGe graded relaxed buffer layer in turn grown on the Si wafer, and an intrin... | 11/28/2000 |
| 6114994 | Photonic time-delay beamsteering system using fiber bragg prism A one-laser technique for optical time-delay beamsteering of a microwave phased-array antenna in transmit-and- receive modes. Arrays of reflective, fiber Bragg gratings are employed and a modulated, wavelength-tuned laser excites prism-shaped arrays of ch... | 09/05/2000 |
| 6000283 | Testing device for oil flow problems in jet engines The testing device is mounted on a portable stand so that it is easily placed near the aircraft engine to be tested. A source of pressure air is further required for the testing device. A portable source or a shop source is sufficient. The testing device ... | 12/14/1999 |
| 5991099 | Adjustable chromatic correction lens An imaging lens device at f/4 has zoomlike variable chromatic and spherochromatic correction for imagery in each of the astronomical U, B, V, and R bands. This lens system can thus take advantage of the full usable wavelength range of CCD cameras extendin... | 11/23/1999 |
| 5969226 | Fretting wear machine A hardened steel ball presses against a vibrating sample to be subject to fretting. The amplitude and frequency of vibration can be precisely controlled by a stack of piezoelectric transducers. The biasing force of the steel ball against the sample can al... | 10/19/1999 |
| 5950303 | Method and fixturing to perform two side laminations of stacked substrates forming 3-D modules A substrate stack is suspended within a stack holder to position upper and lower stack surfaces coplanar with upper and lower holder surfaces. Laminating heat and pressure is simultaneously applied to the upper and lower surfaces to laminate a carrier int... | 09/14/1999 |
| 5946152 | Method of reducing light beam jitter of an incoming light beam Four loudspeaker voice coils are positioned in quadrature relationship, and a movable mirror support member is provided, having a mirror on a central hub portion, and having four outwardly extending orthogonal lightweight struts, each attached to an assoc... | 08/31/1999 |
| 5940685 | Fabrication of UV-sensitive back illuminated CCD image sensors The wafer thickness of a CCD front illuminated silicon wafer is reduced to about ten to twenty microns, the Al substrate is removed and a 5-35 nanometer silicon oxide layer is produced on the thinned back of the silicon wafer followed by implanting boron ... | 08/17/1999 |
| 5926148 | Three dimensional reconfigurable photoconductive antenna array element First and second tandemly positioned electrically biased semiconductor members radiate microwave energy in response to the receipt of an excitation light beam having two wavelengths related to the bandgaps of the members. The projected microwave beam may ... | 07/20/1999 |
| 5923029 | Narrow band optical radiation sensor using pyroelectric material A pair of interleaved finger-like electrodes are positioned over a pyro-electric sheet of polyvinylidine fluoride and a pair of coatings are formed upon the electrodes having different optical reflectance, and as a result, a light beam energy absorption d... | 07/13/1999 |
| 5919316 | Spacecraft solar array design to control differential charging Numerous undesirable prior art epoxy beads or pads of metallization, employed to prevent unacceptable electrostatic charge buildup upon the solar cell coverglasses of solar cell array panels deployed in outer space, are eliminated by causing the charge co... | 07/06/1999 |
| 5920430 | Lensless joint transform optical correlator for precision industrial positioning systems A lensless joint transform correlator optically determines the relative position of two pinholes placed in parallel arms of a Mach-Zehnder interferometer. The Fraunhaufer diffraction patterns combine to form a joint power spectrum signal in the joint tran... | 07/06/1999 |
| 5909296 | Effective wide angle beam steering using spherical laser diode arrays Curved arrays of lasers cause discreet narrow infra-red light beams to be rapidly projected within a wide field of view, without requiring mechanical motion of components. Transmitted and received light beams can be modulated with data to be transmitted b... | 06/01/1999 |
| 5903390 | Two port nonlinear joint transform correlator An all optical photorefractive holographic joint transform correlator provides a first correlation plane output port using two-beam coupling, and a second correlation plane output port employing four-wave mixing. With appropriate input beam intensity rati... | 05/11/1999 |
| 5886837 | Segmented fresnel lens frame Method of assembling a large, lightweight, composite optical device such as a mirror or lens, includes providing a plurality of flat, lightweight optical element sections, fastening each optical element section to an associated frame segment to provide a ... | 03/23/1999 |
| 5880491 | SiC/111-V-nitride heterostructures on SiC/SiO2 /Si for optoelectronic devices A low-cost Si-based construction for optical and electronic bulk-heterostructure devices and multiple-quantum-well devices in which the active layers of the device are SiC or AlGaN or InGaN or InAlN. Material quality is high, and the MQW devices such as b... | 03/09/1999 |
| 5867615 | Compact straight channel fiber optic intensity modular Two modes in the waveguide are excited by establishing the input light polarization at forty-five degrees so that the modes can be excited equally. After propagating through the waveguide, the two modes are forced into one polarization by a polarizing fib... | 02/02/1999 |
| 5859713 | Imaging in a scattering medium using photon density waves Image derogating optical noise due to light scattering of an object under examination, embedded in a light scattering medium, is substantially reduced by passing a modulated signal laser beam through the scattering medium, and interfering the emerging sig... | 01/12/1999 |
| 5838870 | Nanometer-scale silicon-on-insulator photonic componets Nanometer scale silicon-on-insulator (SOI) guided-wave optical components in the near infra-red employ an SOI platform for optical isolation, and single mode silicon strip etched into the buried oxide. A multi-layer core for the strip consistes of several... | 11/17/1998 |
| 5815597 | Binary encoding of gray scale nonlinear joint transform correlators A joint Fourier transform optical correlator is disclosed which can have varying degrees of nonlinearity and yet employ a readily available binary spatial light modulator for producing the correlation output light signal in conjunction with a Fourier tran... | 09/29/1998 |
| 5808226 | Grenade shell laser system A conventional grenade shell launcher contains a laser generator shell thin which directs a blinding flash of light at an adversary to temporarily induce blindness of the adversary carrying out unlawful or dangerous actions such as pointing a weapon at p... | 09/15/1998 |
| 5774490 | Diode-pumped Tm: YAG/HBr four micron laser system An HBr laser is pumped by a slave laser power oscillator which excites the (2,0) absorption band of the HBr laser, to cause it to lase around four microns. A tunable master oscillator, which is frequency locked to an HBr reference cell, seeds the slave os... | 06/30/1998 |
| 5767513 | High temperature octopole ion guide with coaxially heated rods A high-temperature octopole/collision apparatus features coaxially heated rf emitting octopole rods coacting with a collision oven cell. The rods are maintained at a slightly higher temperature than the oven cell to prevent condensation of the sample on t... | 06/16/1998 |
| 5760496 | Inverse-pinch voltage pulse generator A first magnetic flux field is produced in the vicinity of a generally cylindrical pulse generating coil arrangement and a plasma is abruptly and radially displaced outwardly toward the coil arrangement, which in turn displaces the first magnetic flux fie... | 06/02/1998 |
| 5727016 | Spatially coherent diode laser with lenslike media and feedback from straight-toothed gratings In a surface emitting semiconductor laser, a variable index of refraction layer having an approximately parabolically shaped trough therein is positioned adjacent the active lasing region and a straight toothed second order diffraction grating coacts with... | 03/10/1998 |
| 5691629 | Non-volatile power supply having energy efficient DC/DC voltage converters with a small storage capacitor A step-up DC/DC voltage convertor is coupled to a step-down DC/DC voltage convertor via a capacitor, which stores energy and maintains power flow to an output load circuit during a brief interruption of power supplied to the input of the step-up convertor... | 11/25/1997 |
| 5689125 | Cadmium sulfide interface layers for improving III-V semiconductor device performance and characteristics In a Schottky metal junction semiconductor device, a CdS interface layer, having a thickness of under 100 angstroms, is positioned under the Schottky barrier gate of a III-V HEMT, for reducing gate leakage, and for enabling full depletion of the conductin... | 11/18/1997 |
| 5684588 | Homodyne and hetrodyne imaging in a light scattering medium Image derogating optical noise due to light scattering of an object under amination, embedded in, or positioned in front of a light scattering medium, is substantially reduced by employing a two-dimensional all optical phase sensitive holographic detector... | 11/04/1997 |
| 5654538 | Optically addressed general purpose programmable logic device An array of pairs of photodetector elements is provided, where each pair intercepts a set of angularly separated light beams for each pixel, and an array of electrical logic circuits coupled to the photodetector elements, each change the polarization stat... | 08/05/1997 |
| 5653807 | Low temperature vapor phase epitaxial system for depositing thin layers of silicon-germanium alloy An epitaxial film deposition system has a low vacuum venturi pump for initially partially purging the system of toxic gases, and a high vacuum turbo-molecular pump to further sharply reduce the pressure to maximize toxic gas purging along with the detecti... | 08/05/1997 |
| 5652435 | Vertical structure schottky diode optical detector A vertical structure Schottky contact photodiode has a narrow bandgap InGaAs light absorbing layer cladded front and back with InAlAs current blocking layers having metal contacts formed thereon. As compared to single-side MSM photodiodes, with interdigit... | 07/29/1997 |
| 5648872 | Single lens joint transform correlator utilizing a fresnel zone plate signal An amplitude encoded lens function signal, similar to a zone plate, is formed in the transform plane of a chirp encoded joint transform correlator. CCD correlation spot light sensor is separated from the transform plane by the focal length of the encoded ... | 07/15/1997 |
| 5641954 | Programmable delay line using laser diode taps A series of taps are created within an acousto-optic cell by imaging an array of LEDs within the cell. The illuminated tap regions are selectively changed by energizing selected LEDs. The electrical input signal produces a travelling acoustic wave within ... | 06/24/1997 |
| 5639673 | Transparent ohmic contacts for Schottky diode optical detectors on thin and inverted epitaxial layers An InP buffer layer is first formed upon an InP substrate; a thin layer of heavily doped InGaAs, a thick layer of light absorbing InGaAs, and a thin layer of InAlAs are thereafter sequentially grown upon the InP buffer layer. A light reflective Schottky b... | 06/17/1997 |
| 5604634 | All optical nonlinear joint fourier transform correlator A fully parallel, self-aligning, nonlinear and all optical joint transform correlator utilizes a photorefractive four wave mixer positioned to record the joint transform spectrum interfering with a reference beam together with a phase conjugator which dir... | 02/18/1997 |
| 5602387 | Method of protecting an RF receiver in a hostile electromagnetic environment A photonic electro-optic field sensor is positioned adjacent a metallic antenna. Polarized light is passed through the field sensor, and the degree of rotation thereof is proportional to the strength of the RF signal sensed by the antenna. The resulting m... | 02/11/1997 |
| 5567935 | Velocity selected laser ablation metal atom source A pulsed plume of laser ablated photo-ionizable material is emitted from a target in a vacuum, and a pulsed beam of light thereafter produces ionization of two plume sections straddling a central nonionized plume portion. A mask is provided, intermediate ... | 10/22/1996 |
| 5553629 | Portable medical laser pack system A fiber optic cable has one end directly coupled to a semiconductor IR generating laser diode array and the other end is used to direct IR radiation at a soldier's wound for surgical purposes. The beam may also be used to illuminate a dark scene to detect... | 09/10/1996 |
| 5555128 | Phase coding technique for one-way image transmission through an aberrating medium An object beam is passed through an aberrating medium to produce a diffraction distorted image therein, which is imaged upon a spatial light modulator. A probe beam measures the phase aberrated wavefront within the aberrating medium and is used to produce... | 09/10/1996 |
