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| Number | Title | Issue Date |
| 4867564 | Apparatus for and method of remotely sensing sub-surface water temperatures The subsurface temperature of a body of water such as an ocean is measured remotely by directing a laser beam deeply into the water and analyzing the resultant Brillouin and Rayleigh backscatter components. Wavelength shifted Brillouin scatter is mixed wi... | 09/19/1989 |
| 4867558 | Method of remotely detecting submarines using a laser Subsurface waves in a body of water such as an ocean caused by a submarine are remotely nonacoustically detected by monitoring subsurface water temperatures using a laser. A pulsed laser beam is directed into the water to at least the depth of the thermoc... | 09/19/1989 |
| 4839902 | Laser with controlled geometry fluorescent converter The efficiency of an optically pumped solid state laser is substantially improved with a controlled geometry fluorescent converter between the pump light source and the lasing medium. Fluorescent materials have the capability of absorbing broadband pumpin... | 06/13/1989 |
| 4826304 | Adjustable optical mounting assembly An adjustable optical mounting assembly, particularly suited for folding or periscope optics, provides for optical beam motion in three axes using a bearing having a spherical surface. This invention greatly simplifies the mount mechanism and operting pro... | 05/02/1989 |
| 4804891 | Photomultiplier tube with gain control Improved gain control in a photomultiplier tube having a plurality of dynode stages is achieved through manual or automatic change of the bias voltage on at least one of the several dynodes between the anode and cathode of the tube. By such means, maximum... | 02/14/1989 |
| 4785307 | Crossed log-periodic dipole antenna and method of making same A crossed log-periodic dipole antenna having a unique feedline/boom structure providing improved antenna performance. The antenna is assembled from a pair of orthogonally displaced log-periodic antennas each having a pair of half-dipole structures, each s... | 11/15/1988 |
| 4770482 | Scanning system for optical transmitter beams A system for rapidly scanning a remote field of regard with transmitter laser beams comprises an optical system having a focal plane, a plurality of lasers capable of being sequentially fired, and a like number of optical fibers coupled at one end to the ... | 09/13/1988 |
| 4763131 | Log-periodic monopole antenna array In a log-periodic monopole antenna array of the type described in U.S. Pat. No. 3,286,268, each antenna of the array having active elements spaced over the top surface of a ground structure and grounded parasitic elements interspersed between the active e... | 08/09/1988 |
| 4754287 | Log periodic antenna with foreshortened radiating elements The foreshortened dipoles of the antenna described in U.S. Pat. No. 3,732,572 are further substantially shortened without performance impairment with a new construction in which each radiating element comprises a planar rectangular body electrically conne... | 06/28/1988 |
| 4682340 | Apparatus for and method of extracting an output beam from a laser system The output of a laser oscillator is doubly passed through a birefringement medium, a quarter-wave plate and a laser amplifier by reflection from a phase conjugate mirror, the birefringent medium being between the oscillator and the plate in the path of th... | 07/21/1987 |
| 4661936 | Apparatus for and method of doppler motion detection with standing wave drift compensation Drift of the standing wave pattern in an acoustic doppler intrusion detection system in a confined space is compensated by adjusting the relative radiating and receiving positions of the radiator and receiver transducers, respectively, either mechanically... | 04/28/1987 |
| 4652886 | Multilayer antenna aperture polarizer A multilayer antenna aperture polarizer comprises a single continuous electrically conductive trace on a flexible thin dielectric strip, the trace being formed into a plurality of arrays of grid lines with adjacent arrays interconnected by shorting leads ... | 03/24/1987 |
| 4630063 | Log-periodic antenna A log-periodic antenna comprises two arrays of dimensionally tapered radiating elements disposed in the E-plane and each fed by a balanced line consisting of the inner conductors of two coaxial cables. In one embodiment the elements of each array are dipo... | 12/16/1986 |
| 4609909 | Multimode perimeter intrusion detection system A multimode perimeter intrusion detection system comprises at least one elongated electret tape mounted on a barrier, such as a fence or wall, along the perimeter of an area to be protected and operated simultaneously in both active and passive modes to d... | 09/02/1986 |
| 4558452 | Narrow bandwidth laser apparatus Laser apparatus having a very narrow ( | 12/10/1985 |
| 4553244 | Laser beam energy profile synthesizer The annular energy distribution in the output beam of a laser having an unstable resonator is evenly distributed across the entire beam profile by a synthesizer comprising a pair of mirrors adjacent to the output end of the resonator and operative on the ... | 11/12/1985 |
| 4488040 | Fiber optic sensor A fiber optic sensor useful, for example, in intrusion detection systems for sensing seismic or pressure disturbances produced by an intruder, comprises a cable having an optical fiber core for transmitting the output of a laser, a hard preferably electri... | 12/11/1984 |
| 4479127 | Bi-loop antenna system A bi-loop antenna system comprises an array of four bi-loop antennas equally spaced from the array axis and fed in phase and with equal power. Each antenna comprises an electrical conductor configured as two substantially identical open-ended coplanar loo... | 10/23/1984 |
| 4477905 | Short pulse laser The width of the output pulse of a Q-switched cavity dump laser is substantially reduced by rapidly discharging a high voltage across the cavity dump crystal with an electro-optical switch which is closed by regenerative feedback from the optical output o... | 10/16/1984 |
| 4471360 | Antenna with articulated dipole element An articulated element for an antenna such as a log-periodic dipole antenna having an elongated boom comprises an inner tubular section secured to the boom and an outer tubular section movable relative to the inner section between an extended or operative... | 09/11/1984 |
| 4460895 | Integrated erectable antenna system An integrated erectable antenna system comprises a mast pivotally mounted for rotation between a horizontal stowed position and a vertical operative position, and a log-periodic antenna assembly longitudinally slidably and pivotally mounted on the mast fo... | 07/17/1984 |
| 4451832 | Radio frequency transmitter coupling circuit An efficient circuit for coupling at least two radio frequency transmitters of arbitrary power and frequency to one antenna comprises a three-port ferrite circulator connected to the output of each transmitter, a tee connector with a predetermined impedan... | 05/29/1984 |
| 4449128 | Radio frequency transmitter coupling circuit An efficient circuit for coupling at least three radio frequency transmitters of arbitrary power and frequency to one antenna comprises a three-port circulator connected to the output of each transmitter, a four-port connector and a five-port inphase powe... | 05/15/1984 |
| 4441186 | Electronically switchable multiwavelength laser system An electronically switchable multiwavelength laser system comprises a lasing medium capable of generating a beam having at least two different wavelengths, an anisotropic birefringent component in optical alignment with the medium for refracting the beam ... | 04/03/1984 |
| 4435480 | Pressed and sintered composite body comprising a thin tape cast layer and a thick base layer A composite body has a pressed mix base or layer and a thin facing layer formed by casting and bonded to the base and having desired physical properities different from those of the base. This body has utility as a semiconductor substrate with the cast la... | 03/06/1984 |
| 4434425 | Multiple ring dipole array A multiple ring dipole array comprises a plurality of dipole elements arranged in concentric rings and in a common plane. Each ring has a plurality of circumferentially spaced dipole elements, preferably folded dipoles, having equal lengths and disposed i... | 02/28/1984 |
| 4431465 | Brazing alloy paste An improved brazing alloy paste comprises a brazing alloy powder mixed with a ductile metal spacer powder comprised of spherical particles with a predetermined diameter limit and having a higher melting temperature than that of the alloy, both powders bei... | 02/14/1984 |
| 4429394 | Conduction cooled solid state laser A conduction cooled solid state laser comprises a laser rod and a pump lamp within a pump cavity in a housing constituting a heat sink, the remote exterior surfaces of the rod and lamp being covered by highly reflective metal foils in intimate contact wit... | 01/31/1984 |
| 4420459 | Method of making preforms for brazing and hardfacing A method of making preforms from brittle metals for brazing or hardfacing consists of pulverizing the metals into a powder, mixing the powder with a liquid vehicle to form a paste, passing the paste through a coated screen having an opening in the coating... | 12/13/1983 |
| 4408925 | Cable tension meter A turnbuckle assembly has a self-contained tension pre-load indicator utilizing internally mounted compact conical spring washers (belleville washers) and a radially projecting movable stem which is rendered immovable when the washers are fully compressed... | 10/11/1983 |
| 4405889 | Power supply for repetitive discharge apparatus A power supply for repetitive discharge apparatus such as a laser comprises an unregulated DC source, a primary storage capacitor, a discharge capacitor forming part of the apparatus and an energy feedback circuit between the discharge and storage capacit... | 09/20/1983 |
| 4405975 | Power supply start-up circuit A power supply start-up circuit for apparatus having a storage capacitor comprises a bistable switch with a trigger terminal and connected between one terminal of a DC source and the storage capacitor, a resistor connected across the switch, a trigger cap... | 09/20/1983 |
| 4393505 | Gas discharge laser having a buffer gas of neon The output power and efficiency of a gas discharge laser is substantially improved by the substitution of neon (Ne) for helium (He) as a buffer in the lasing medium. One embodiment of the invention is a pulsed excimer laser having a lasing gas comprising ... | 07/12/1983 |
| 4390993 | Laser electrode assembly A laser electrode assembly comprises an elongated bar having a plurality of longitudinally spaced sockets and is removably secured to a carrier which is anchored to the laser base and has a like number of plugs resiliently press-fitted within the sockets,... | 06/28/1983 |
| 4382196 | Tape transducer A tape transducer comprising an inner conductive strip laminate sandwiched between and totally enclosed by identical outer conductive strip laminates. The inner laminate has an inner conductive strip having opposite sides to which thin dielectric layers a... | 05/03/1983 |
| 4377339 | Projection optical lithography apparatus In a printed circuit formation process, a positive photoresist layer on a semiconductor substrate surface is exposed to light in a projection exposure system through a transparent liquid-gate which has an index of refraction nL closer to the in... | 03/22/1983 |
| 4370182 | Method of making tape transducer A method of continuously making a composite tape transducer consisting of the steps of electrically charging dielectric layers on opposite sides of a conductive inner strip to form electrets, applying wider outer laminates symmetrically to opposite sides ... | 01/25/1983 |
| 4357299 | Brazing alloy filler for joining cemented carbide to steel A copper base brazing alloy consisting of, in percent by weight, 25 to 40 manganese, 0 to 10 nickel, 0 to 10 iron, 0 to 6 indium and 0 to 10 tin with the combination of tin and indium being not less than 2, and the balance essentially copper, is suitable ... | 11/02/1982 |
| 4344810 | Apparatus for making tape transducer Apparatus for continuously producing an elongated composite tape transducer having an inner laminate with a conductive dielectric-covered strip and two outer laminates each with a conductive foil comprises two reels containing the outer laminates and one ... | 08/17/1982 |
| 4340650 | Multi-layer composite brazing alloy A multi-layer composite brazing alloy useful in mine drills for attaching hardened bits, such as tungsten carbide, to bit holders made of steel and the like, comprises two outer layers of a brazing alloy bonded to an inner layer or core of iron or nickel.... | 07/20/1982 |
