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A self defense weapon formed as a memo pad and which is easily held by a person's fingers, therefore making it possible to provide protection from a mugger and also to quickly and easily write a record or a message without failure of missing or forgetting significant information under a stressful situation.
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| Number | Title | Issue Date |
| 4694696 | Vibration-type gyro apparatus A vibration-type gyro apparatus is disclosed, which includes a vibration mass portion, a piezo-electric element for detecting the displacement of the apparatus and a preamplifier having an input resistance R and supplied with the output from the piezo-ele... | 09/22/1987 |
| 4658647 | Accelerometer An accelerometer comprises a pair of stators, a permanent magnet arranged within each of the stators, arcuate support portions diametrically opposed to each other on the surface of each stator, a pair of ring members each of which is positioned on the arc... | 04/21/1987 |
| 4620442 | Digital accelerometer A digital accelerometer comprising a linear analog accelerometer and a digitizer. The analog accelerometer includes a housing and conductor means extending outside the housing, and is adapted to produce on the conductor means an analog signal representing... | 11/04/1986 |
| 4603483 | Thermal gradient compensator for fluid rotor gyroscopic apparatus A fluid sphere gyroscope is used as the north-seeking sensing element in a gyrocompass. A sensor responsive to angular deviation of the gyroscope from the horizontal provides a tilt signal which is used to energize heating elements located along the indep... | 08/05/1986 |
| 4592234 | Suspension system for a transducer Thermally induced stress between a quartz proof mass and the metal stators which constrain it are relieved by a suspension system employing pliant members. Contact points between the proof mass and the stators are formed by raised pads on the proof mass w... | 06/03/1986 |
| 4584878 | Gas-rate sensor A gas-rate sensor is disclosed which comprises, similar to a conventional one, a hollow cylindrical casing with a gas sealed therein, a gas pump arranged within the casing at its one end to circulate the gas therein, a nozzle means arranged within the cas... | 04/29/1986 |
| 4555945 | Method and apparatus for producing a controlled preload on a transducer assembly by means of a composite material sleeve A transducer assembly includes first and second stators which are axially aligned with, and bear upon opposite sides of a proof mass. The stators and proof mass are clamped together by means of a sleeve having a side portion with upper and lower flanges p... | 12/03/1985 |
| 4531701 | Multisensor mounting apparatus A mounting technique and apparatus is disclosed for precision instrumentation and capable of allowing temperature induced dimensional changes without significantly affecting the precision of the instruments. A polymeric material is disposed on the surface... | 07/30/1985 |
| 4467651 | Method for determining acceleration An accelerometer has two proof masses each constrained from movement by a beam resonant force transducer. The proof mass-force transducer systems are mounted with the sensitive axes of the proof masses aligned and the force transducers arranged so that th... | 08/28/1984 |
| 4430894 | Adjustable fluid resistors for use in an integrating accelerometer An improved integrating accelerometer having a plurality of proof masses adapted to move relative to a casing in response to accelerations of the casing, a temperature compensated damping mechanism, and fluid resistors for extending the temperature operat... | 02/14/1984 |
| 4430895 | Piezoresistive accelerometer A piezoresistive acceleration sensing transducer is disclosed which enables low cost microcircuit construction of accelerometers. A silicon wafer is etched to form individual acceleration sensing elements each of which includes a mass ring suspended from ... | 02/14/1984 |
| 4414848 | Three-axis accelerometer A proof mass for an accelerometer is electromagnetically constrained in three orthogonal directions. An array of filaments forms an elastic suspension for the proof mass to constrain it in the remaining degrees of freedom. The resulting instrument has the... | 11/15/1983 |
| 4408490 | Angular velocity sensor A heating wire is wound around a casing within which a sensor body is placed. Thermo-sensitive switch means is connected to the heating wire, which is responsive to the temperature within the casing to control the rate at which electric current is supplie... | 10/11/1983 |
| 4398417 | Three-axis accelerometer having flexure bearing with overload protection A proof mass for an accelerometer is electromagnetically constrained in three orthogonal directions. An array of filaments forms an elastic suspension for the proof mass to constrain it in the remaining degrees of freedom. The resulting instrument has the... | 08/16/1983 |
| 4370891 | Dual element-single oscillator-ratio type digital transducer A compensated measurement system utilizing dual sensing elements (10, 12) and a single variable frequency oscillator (14). A common operative association between the sensing elements (10, 12) and the oscillator (14) is achieved by multiplexing. Temperatur... | 02/01/1983 |
| 4338819 | Accelerometer including an overall arrangement for reducing temperature related errors A pendulous type of oil filled accelerometer is disclosed herein, specifically one which is sensitive to temperature changes sufficient to introduce a temperature related error into its output signal, if left uncorrected. A technique which compensates for... | 07/13/1982 |
| 4336718 | Control circuit for accelerometer A pendulously supported proof mass accelerometer wherein a pulse generator applies periodic pulses to a bridge circuit comprising variable resistors and pick-off capacitors to generate a restoring current to maintain the proof mass in a null position. The... | 06/29/1982 |
| 4258572 | Single axis crystal constrained temperature compensated digital accelerometer An accelerometer utilizes a pair of SC-cut crystals which respond differentially to acceleration inputs. Each crystal exhibits a highly temperature sensitive resonant mode and a relatively temperature insensitive resonant mode. Both modes are excited simu... | 03/31/1981 |
| 4186609 | Eddy-current device for measuring rotational speed An eddy-current speedometer having a rotatably driven permanent magnetic element and a cooperating eddy-current rotary element provided with an indicating device and mounted to rotate coaxially therewith and be set rotating by alternating magnetic fields ... | 02/05/1980 |
| 4182187 | Force balancing assembly for transducers In order to reduce bias errors resulting from mounting of a force restoring coil assembly element of a force balancing transducer, the force coil assembly is suspended by means of one or more hinges from a force sensing movable member, which includes posi... | 01/08/1980 |
| 4169387 | Transducer for mechanical measured variables, especially a pressure transducer A transducer for mechanical measured variables, especially a pressure transducer, having a heat pipe system within the housing, the heat pipe system is connected on one side to the thermally high stressed parts of the transducer, and on the other side to ... | 10/02/1979 |
| 4155257 | Temperature compensated vibrating beam accelerometer A temperature compensation mechanism for a vibrating beam accelerometer comprising first and second bridge circuits. A quadrature signal is applied to the first bridge circuit containing the quartz crystal which pulls the resonant frequency of the quartz ... | 05/22/1979 |
| 4144769 | Electronic compensation for temperature variation of gyroscope damping A signal compensator is combined with a second order system, for example, a fluid damped rate gyroscope, which produces a signal in response to the movements of a damped member for providing an output signal which is indicative of the input to the second ... | 03/20/1979 |
| 4144764 | Servo amplifier for an electrically damped accelerometer A servo amplifier system for an accelerometer includes a torque coil. A torque coil is included in the output circuit of a first amplifier. A position sensor circuit develops a signal corresponding to the position of the coil which is applied to the input... | 03/20/1979 |
| 4128010 | Temperature compensated permanent magnet/moving coil accelerometer A temperature compensated accelerometer of the type having a permanent magnet, moving coil rebalance system is disclosed. A cylindrical permanent magnet and surrounding sleeve produce radial magnetic fields in annular regions in which are located rebalanc... | 12/05/1978 |
| 4099415 | Temperature compensation circuit for a fluid damped servo system The servo system has a fluid damped moving mass, a pickoff providing a signal indicative of the position of the moving mass, and a torquer disposed to move the mass. A single operational amplifier has a pair of inputs and an output. One input is connected... | 07/11/1978 |
| 4088026 | Linear accelerometer mechanism Linear accelerometer mechanism having a housing and a pendulous member. Means is provided for pivotally mounting the pendulous member in the housing. A torque coil is carried by the pendulous member and first and second magnets are mounted in the torque c... | 05/09/1978 |
| 4083237 | Differential reluctance motion detector A displacement detector yielding an electrical output signal that is linearly proportional to the extent of input motion. The input motion to be monitored is applied to the shiftable armature of a differential reluctance transducer constituted by a pair o... | 04/11/1978 |
| 4028815 | Temperature compensated toroidal accelerometer A toroidal accelerometer including a toroidal shaped housing having first and second oppositely disposed arcuate shaped electrodes and a third electrode which is a common electrode, all three electrodes being partially immersed in an electrolytic fluid an... | 06/14/1977 |
| 4026158 | Temperature compensation for a damped fluid proof mass accelerometer In an accelerometer in which a proof mass is disposed in a damping fluid and acts against said fluid through a flow path controlled by the groove length of a helix disposed on a bellows, a low resistance flow path is provided connecting the areas above an... | 05/31/1977 |
| 4020699 | Temperature stabilized fluidic angular rate sensor The measurement bridge of a fluidic angular rate sensor in which a pair of temperature sensitive resistive elements are differentially cooled by a jet of fluid, the direction of which lags the position of the resistive elements when the rate sensor is rot... | 05/03/1977 |
| 3992951 | Compensated toroidal accelerometer A toroidal accelerometer having a housing containing an electrolytic fluid at least partially immersing a plurality of electrodes disposed within said housing and an amplifier circuit coupled to the electrodes for providing an output signal indicative of ... | 11/23/1976 |
| 3987394 | Operational circuitry for gas turbine engine control A mathematical expression is converted and approximations applied to remove complex processes, simplifying the circuitry of system which controls compressor speed in dependence on ambient temperature.... | 10/19/1976 |
