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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 7443342 | Reception time determining apparatus and distance measuring apparatus using the same The invention provides a reception time determining apparatus which can measure reception time to a high accuracy, without expanding an occupied bandwidth, and a distance measuring apparatus which uses the reception time determining apparatus. There is provid... | 10/28/2008 |
| 7197932 | Failure detecting system The present invention relates to a failure detecting system that enables the detection of a break in a rail and the like by a simple network configuration. Detecting units (20 and 50), relay units (30A, 30B, 60A through 60C)... | 04/03/2007 |
| 6774445 | Actuator The invention aims at suppressing an amount of deformation of a central portion of a movable part in a micro-miniature semiconductor actuator. A boundary portion is provided between a central portion and an edge of a movable part which is axially supported in a rota... | 08/10/2004 |
| 6657762 | Optical barrier device The present invention relates to an optical barrier apparatus which scans a detection area with an optical beam, and when the scanning beam is blocked by an object so that a reflection beam is not received, notifies of object presence. An optical beam fro... | 12/02/2003 |
| 6504485 | Monitoring apparatus and control apparatus for traffic signal lights Monitoring and control apparatus for fail-safe monitoring for normal operation of traffic signal lights provided at an intersection or the like where a plurality of roads intersect. The illumination conditions of respective signal lights are detected usin... | 01/07/2003 |
| 6485228 | Method and device for recovering liquid substance A method for recovering a liquid substance such as fuel oil from ships sunk or stranded due to marine accidents and from storage facilities by more easily heating the liquid substance to reduce its viscosity, and a device for recovering liquid substance. ... | 11/26/2002 |
| 6459656 | Information generating apparatus using elastic waves The present invention relates to an information generating apparatus for transmitting and receiving elastic waves through a rail for a train. The information generating apparatus comprises elastic wave transmitting means for transmitting elastic waves to ... | 10/01/2002 |
| 6457650 | Card with display function An object of the invention is to provide a thin, low cost card with a display function in which the card display information is able to be rewritten within the card itself, without the use of an external rewriting apparatus. For this purpose, a card with ... | 10/01/2002 |
| 6456413 | Planar type optical scanning apparatus and mounting structure thereof The present invention relates to a planar type optical scanning apparatus and a mounting structure thereof, which enables further miniaturization and cost reduction. By locating a mirror (14), on the surface side of a movable plate (12) that is axially su... | 09/24/2002 |
| 6434025 | Power supply unit The invention relates to a power supply unit which can fail-safely monitor not only for an excessive power supply output but also for an abnormal drop in output level. At the time of start-up, with the start signal from a start circuit, an AC signal is su... | 08/13/2002 |
| 6392451 | Threshold value operation circuit, and, and gate circuit, self hold circuit, start signal generation circuit using threshold value operation circuit The invention relates to a threshold value operation circuit which can perform an analogue type threshold value operation, and which can generate an AC signal with a stabilized frequency and duty ratio which is not influenced by input signal level or char... | 05/21/2002 |
| 6334077 | Operation apparatus for press The present invention provides an operation apparatus for a press, of simple structure with lower cost. The operation apparatus for a press according to the present invention comprises a controlling system 1 for generating a slide actuation command signal... | 12/25/2001 |
| 6292524 | Counting apparatus and rotation stopped detection apparatus which uses a counting apparatus A counting apparatus having excellent fail-safe characteristics can be used in a rotation-stopped detection apparatus. As a first feature, timing of a high-frequency signal P2 is carried out by a counter 1 after completion of a counting of puls... | 09/18/2001 |
| 6292432 | Information generating apparatus using elastic waves The present invention relates to an information generating apparatus for transmitting and receiving elastic waves through a rail for a train. The information generating apparatus comprises elastic wave transmitting means for transmitting elastic waves to ... | 09/18/2001 |
| 6272001 | Emergency stop switch and emergency stop switch circuit A transformer structured emergency stop switch (10) incorporates a first core member (14) wound with primary and secondary windings, and a second core member (15) which at normal times contacts with the first core member (14) under spring force and in an ... | 08/07/2001 |
| 6241418 | Device for blocking exit of car from parking lot An apparatus for blocking a parking vehicle from leaving, enabling a driver to confirm the locking board which is in the elevated state, and preventing the vehicle from leaving in an unauthorized manner. The apparatus does not employ any constitution for ... | 06/05/2001 |
| 6239956 | Fail-safe timing circuit and on-delay circuit using the same The present invention relates to a fail-safe timing circuit and on-delay circuit which does not produce an erroneous output where the delay time is shortened, due to a fault. The timing circuit comprises: an oscillation circuit (11) which produces a timin... | 05/29/2001 |
| 6184799 | Monitoring apparatus and control apparatus for traffic signal lights Monitoring and control apparatus for fail-safe monitoring for normal operation of traffic signal lights provided at an intersection or the like where a plurality of roads intersect. The illumination conditions of respective signal lights are detected usin... | 02/06/2001 |
| 6148055 | Counter and a revolution stop detection apparatus using the counter A counting apparatus having excellent fail-safe characteristics can be used in a rotation-stopped detection apparatus. As a first feature, timing of a high-frequency signal P2 is carried out by a counter 1 after completion of a counting of puls... | 11/14/2000 |
| 6047634 | Fail-safe automatic sliding operation control apparatus for press The present invention relates to a fail-safe automatic sliding operation control apparatus for a press. The entrance and withdrawal behaviors of an operator's hand relative to danger zones (D, DN) on a bolster of the press are detected by an ou... | 04/11/2000 |
| 6034449 | Load drive circuit The invention relates to a load drive circuit wherein an emergency shutdown switch for forcible interruption and a normal shutdown switch for normal current control are disposed in series in a load power supply circuit. An emergency shutdown switch (SW | 03/07/2000 |
| 6031790 | Information generator using elastic wave The present invention relates to an information generating apparatus for transmitting and receiving elastic waves through a transmission medium and for generating information which is necessary for controlling/monitoring associated elements of a control s... | 02/29/2000 |
| 6002249 | Rotation detection sensor A rotation stopped detection sensor detects a rotation stopped condition of a rotatable body using a plurality of optical sensors. The detection sensor also includes a rotation disk having optical guide portions for guiding light beams from light emitting... | 12/14/1999 |
| 5966009 | Electromagnetic actuator and manufacturing method therefor A portion of a torsion bar (6) for axially supporting a movable plate (5) of a planar electromagnetic actuator, is made conducting by diffusing boron therein in a high concentration. An external power source can thus be electrically connected to a planar ... | 10/12/1999 |
| 5912608 | Planar type electromagnetic actuator The present invention relates to a planar type electromagnetic actuator of two axis construction, having two movable plates (12A, 12B) with pivotal supports at right angles to each other. A pair of static magnetic field generating devices (4, 5) are arran... | 06/15/1999 |
| 5905354 | Motor stopped verification sensor The present invention relates to a sensor for verifying that a motor has stopped rotating including rotation due to inertia. Respective signal input lines are connected to three power supply lines of a three phase AC motor. A high frequency signal current is s... | 05/18/1999 |
| 5872496 | Planar type electromagnetic relay and method of manufacturing thereof A slim-type small size electromagnetic relay is made using semiconductor manufacturing techniques to form a silicon substrate 2 having a planar movable plate 5 and a torsion bar 6 for axially supporting the movable plate 5 formed integrally therewith, wit... | 02/16/1999 |
| 5867775 | Fail-safe signal transmitting apparatus producing a logical product of an input signal and a carrier signal A fail-safe signal transmitting apparatus including a power supply which does not let a transmission output signal generate an error that would allow a dangerous situation to arise even when a multiple failure has occurred in circuits constituting the sig... | 02/02/1999 |
| 5825144 | Drive control apparatus for a rotating machine The invention relates to a drive control apparatus for a rotating machine having a movable part which is rotatably driven by a motor. The apparatus has a fail-safe construction which gives an output of logic value "1" when the movable part is stopped, wherein,... | 10/20/1998 |
| 5818681 | Electromagnetic relay drive circuit The invention relates to an electromagnetic relay drive circuit which generates an electromagnetic relay excitation signal after first verifying that the electromagnetic relay make contact points are off. A forced-operation electromagnetic relay with make... | 10/06/1998 |
| 5798703 | Mat sensor The invention relates to a highly reliable mat sensor which can also detect temporary faults in a sensor portion. Two sensor portions are provided, and agreement or disagreement of an ON/OFF condition of the output from the two sensor portions is detected... | 08/25/1998 |
| 5793329 | Object detection apparatus The presence/absence of an object, movement of the object, the direction of movement, the speed of movement, the shape of the object, the quantity of objects and time information related to these factors are detected without installing a means for transmi... | 08/11/1998 |
| 5793197 | Apparatus for confirming stop of movable portion A detection means 1 detects changes in impedance generated at a coil TC caused in response to indentations Py1 and Py2 and projections provided at the surface of a movable portion Rot to generate a detection signal thereof. A speed judgement circuit 2, to... | 08/11/1998 |
| 5773972 | Transition detection circuit for detecting transitions in the state of an object of detection A detector 1, with its object of detection having operation characteristics that include a shift from a first state to a second state, outputs a signal e1 that corresponds to the operation characteristics of the object of detection. A first state detectio... | 06/30/1998 |
| 5768077 | Earthing wire disconnection detection apparatus and leakage detection apparatus having an earthing wire disconnection detection function conductor A leakage and earthing wire disconnection detection apparatus monitors for earthing wire disconnection and leakage of an electrical or electronic device during operation of the device. Two earthing wires are independently provided for the electrical or el... | 06/16/1998 |
| 5763783 | Acceleration sensor The present invention relates to an acceleration sensor which uses magnetic coupling to detect acceleration. A mass portion 3 is movably supported on a frame 2 by means of support beams 4. A first planar coil 5 is disposed on the mass portion 3, and a sec... | 06/09/1998 |
| 5734269 | Bridge circuit fault monitoring apparatus using an output signal level from a bridge circuit and a power source current level to determine faults A bridge circuit monitoring apparatus which can accurately detect a fault in a bridge circuit of a sensor circuit even when multiple faults occur. Changes in the imbalance output signal of a bridge circuit (11) are monitored with a first window comparator... | 03/31/1998 |
| 5717302 | Motor stopped verification apparatus The invention relates to a motor stopped verification apparatus for verifying if a motor has stopped rotating, and in particular to rotation sensor technology for sampling rotation signals from a motor. With a first aspect of the invention, a high frequen... | 02/10/1998 |
| 5703452 | Safety ensuring apparatus A movable section of a machine is enclosed by a fence and a door. A locking device provided on the door is controlled by a movable section control circuit. In the movable section control circuit, an operating switch outputs either a movable section ON sig... | 12/30/1997 |
| 5666081 | On-delay circuit The present invention relates to a fail-safe on-delay circuit which uses an an electronic circuit. An input signal higher than a power source potential is input to a PUT oscillating circuit and a pulse signal generated with a predetermined time constant, ... | 09/09/1997 |
