Did You Know...
...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
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| Number | Title | Issue Date |
| 6184757 | Cryogenic electronic assembly A number of electronic modules 82, 82', 83, 83' are mounted on a cold finger 100 disposed within a sealed housing 104, 110, the interior 210 of which is evacuated. To minimize heat transfer by conduction, gaps are provided in the dielectric substrates car... | 02/06/2001 |
| 6154910 | Bridge stabilization A bridge deck (10) is supported by tensile supports (11 and 12) and stabilized to reduce the overall aerodynamic lift on the deck (10) by the addition of aerofoil stabilizers (19 and 20) pivotally secured about respective axes (21) generally longitudinal ... | 12/05/2000 |
| 6058847 | Submersible mine neutralisation vehicle A mine neutralisation vehicle comprises a first portion to which propulsion units are attached by which propulsion units the vehicle is positioned. Pivotally connected to the first section is a second section containing a shaped charge warhead. By means o... | 05/09/2000 |
| 6055634 | Secure internal communication system A communications system includes a plurality of interfaces (20) each of which can receive and/or transmit data to a common transmission network (21). Each interface (20) transmitting data to the network (21) attaches a classification code to the transmitt... | 04/25/2000 |
| 5926759 | Telecommunications system The invention provides a system and method whereby a mobile station of telecommunications system selects one of a number of fixed ground stations by which the mobile station communicates with the public switched telephone network or other such system, sel... | 07/20/1999 |
| 5864135 | Thermal imager referencing system A thermal imager referencing system comprises two rotating cranks in the form of discs (7, 8) each pivotally attached to connecting member (9). The discs (7, 8) are rotated at a constant speed causing two mirrors laterally displaced along connecting membe... | 01/26/1999 |
| 5860477 | Underwater oil field apparatus A latching mechanism for a sub-sea control module is constructed with energy storing means such that a latch is cooked into an unlatched condition by the action of lifting the sub-sea control module to store energy in the energy storing means and is moved... | 01/19/1999 |
| 5821544 | Electron microscope specimen supports A specimen support for use in an electron microscope comprises a deposited diamond film. The film is deposited on a substrate using a plasma assisted chemical vapor deposition process and then machined to a desired configuration using a laser machining pr... | 10/13/1998 |
| 5668552 | Analogue-to-digital converters An analog-to-digital converter includes an input for analog signals, a quantizer for producing a digital signal output, a feedback loop for feeding a signal derived from the digital output to be combined in analog form with the analog input for input to a... | 09/16/1997 |
| 5592296 | Exhaust gas particle sensor In a exhaust smoke sensor a light emitter generates a light beam which passes through a region containing the exhaust gas to a first light sensor. To reduce interference the light emitter is driven by a near square wave signal produced by passing a square... | 01/07/1997 |
| 5510890 | Laser radar with reference beam storage In a laser radar system, in which pulses from a laser are focused by a telescope onto a target, the back-scattered radiation being deflected by polarizing beam splitter onto a detector in conjunction with a reference beam, the reference beam being produce... | 04/23/1996 |
| 5483683 | Changeover means for r.f. source A changeover device provides for contactless interchange of power between an r.f. source such as a transmitter Tx1 and two loads, such as an aerial 2 and a test load 3. The device may be used in a changeover system for exchanging main and stand... | 01/09/1996 |
| 5481868 | Variable area nozzle with fixed convergent-divergent walls and relatively movable parallel sideplates A variable area convergent-divergent nozzle for use as an attitude control thruster on a VTOL aircraft is formed by a curved wall forming a chamber a convergent section a throat section and a divergent section and a pair of parallel side plates, one of th... | 01/09/1996 |
| 5438693 | R. F. mixer A mixer of the commutating type using FETs to switch between the primary of a transformer for an r.f. input and the secondary of a transformer 2 for an i.f. output. The mixer has high linearity and low power consumption of the local oscillator drive becau... | 08/01/1995 |
| 5412254 | High voltage pulse generator A high voltage pulse generator for providing a high voltage pulse across a dielectric switch comprises a main high voltage pulse generator, an energy storing pulse forming line connected at one end to the main pulse generator and connected at the other en... | 05/02/1995 |
| 5391873 | Imaging apparatus compensating for nonuniformity in detector outputs This invention provides imaging apparatus in which an image is scanned over an array of sensing elements 2, the outputs of which form a plurality of channels. Signal processing means 6 adds a noise signal to at least some of the channels to more closely m... | 02/21/1995 |
| 5392039 | Sigma-delta analog to digital converter An analog-to-digital converter has an input for receiving analog signals, a quantizer for producing a digital output of the converter, a first combining node for combining the analog input with a first feedback signal derived from the digital output and p... | 02/21/1995 |
| 5389890 | Combiners for R.F. power amplifiers Directional couplers 71 -720 are used to couple power from r.f. power amplifier modules 51 -520 to a transmission line 6 or other type of resonator, from which it is withdrawn by directional coupler 8. The power... | 02/14/1995 |
| 5376804 | Optical analysis system and positioning apparatus thereof An optical analysis or processing system for use, for example, in the analysis of microscopic spots of material by their effect on a very fine polarized beam of light (e.g., FPIA). For multiple "spot" analysis the spot samples are disposed on a substrate ... | 12/27/1994 |
| 5374992 | Exhaust gas particle sensor An exhaust gas particle sensor has an inlet tube and a sensing region having different cross sections and linked by a transition region including a number of baffles arranged so that the time taken for gas to travel from the inlet tube to the sensing regi... | 12/20/1994 |
| 5351521 | Measurement of gas and water content in oil A device for measuring the relative proportions of gas, oil and water in a conductive pipe includes at least one open-ended, conductive tube having a radius different from the pipe, disposed within the pipe. Microwave transmission structure transmits micr... | 10/04/1994 |
| 5341135 | Analogue-to-digital converters, digital-to-analogue converters, and digital modulators An analog-to-digital converter includes a filter having an input for receiving, via a summing node, a signal derived from the analog input signal. A first quantizer produces a first digital signal from a signal derived from the output of the filter. A fee... | 08/23/1994 |
| 5293168 | Radar apparatus and method The invention provides a method of determining the range of a radar signal reflecting object by utilizing a radar frequency carrier wave modulated by a first short code having a first repetition rate and a second code having a bit rate equal to the first ... | 03/08/1994 |
| 5181013 | Display apparatus A cathode ray tube is used to address a spatial light modulator. The light used to read the spatial light modulator is preferably passed through an acoustic optical tunable filter to enable the wavelength and intensity to be rapidly controlled to provide,... | 01/19/1993 |
| 5081693 | Thermal imager arrangements Pictorial data from a thermal imager is applied on a line to a RAM at which a histogram representing the numerical distribution of pixel values is produced. This is applied to a microprocessor which uses the histogram to produce a transform to control the... | 01/14/1992 |
| 5027120 | Delta-sigma converter with bandpass filter for noise reduction in receivers Analogue signals are converted to digital data by use of a Sigma-Delta modulator including a pair of bandpass filters and a feedback loop including a digital to analogue converter. The tendency of such a circuit to instability is reduced or eliminated by ... | 06/25/1991 |
| 4950056 | Optical system Catadioptric optical systems are generally arranged to view a fixed large field of view. Apparatus for steering a field of view includes a pair of Risley prisms, which are disc shaped prisms having a generally shallow wedge like side cross-section, arrang... | 08/21/1990 |
