Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 5039842 | Mold heater moisture detection and dry out apparatus Plastic mold heater moisture detection and dry out apparatus for detecting the presence of moisture in the plastic molding heaters and for drying out the heaters. The plastic mold heater moisture detection and dry out apparatus includes a heater leakage c... | 08/13/1991 |
| 5034731 | Automatic appliance electric state signalling label The appliance according to the invention has a front face with retention means adapted for cooperating with fixing means belonging to a removable label with rank or function identification characters. This label is molded over an electronic circuit compri... | 07/23/1991 |
| 5025195 | Current monitoring A circuit arrangement includes a lamp filament (1) as a load and a resistor (2) in series with the filament. For detecting the current through the load, the source of a MOSFET (6) is connected with the end of the resistor remote from the filament, the dra... | 06/18/1991 |
| 5019956 | Power control apparatus In this power control apparatus, a current flowing in a main current (201) is detected by a current transformer (202) and a zero-phase current transformer (203), provided in the main circuit. A value of this current is provided to a CPU (214) included in ... | 05/28/1991 |
| 5015944 | Current indicating device A unitary, self-contained device for sensing and signalling the flow of current through a conductor includes a toroidal coil of electrically conductive wire having two ends, and an illuminating device electrically connected to the two ends of the wire, re... | 05/14/1991 |
| 5014043 | Current sensing A current sensing device particularly for rotor ground fault detection in a highly inductive field is able to sense and identify the location of low order fault current when the load current in conductors is on the order of at least 1,000 amperes. Laminat... | 05/07/1991 |
| 5008651 | Battery-powered fault indicator A fault indicator operable from an internal battery for indicating the occurrence of a fault current in a monitored electrical conductor of an AC power distribution system. Upon occurrence of a fault current a reed switch in magnetic communication with th... | 04/16/1991 |
| 5003297 | Method of detecting failure to tighten screws against works and device therefor A method of detecting failure to tighten screws against works includes steps of detecting every screw tightening operation against a work after start of a screw tightening step, counting the number of times of the screw tightening operations detected in t... | 03/26/1991 |
| 5001465 | Crane boom electrostatic . . . alarm A plurality of electrostatic field proximity sensors are mounted upon a crane boom. The sensors are capacitive elements and include an antenna. The sensors are electrically connected in parallel with a single wire. A summing amplifier is coupled to the se... | 03/19/1991 |
| 4990893 | Method in alarm system, including recording of energy consumption A method for an alarm system is intended in particular for the monitoring of service apartments for elderly and/or handicapped persons. The energy consumption of each apartment is recorded over a period, for example in a computer. The results are presente... | 02/05/1991 |
| 4991042 | Digital circuit interrupter with keypad data entry and display A circuit breaker containing an electronic trip unit utilizes a digital keypad and display to enter and display the trip parameters. The trip parameters are determined by means of a setpoint value that is incremented by means of an algorithm whenever the ... | 02/05/1991 |
| 4985761 | Current detection circuit and method An apparatus for sensing operational status of a system including a television set includes a reference source, means for determining a level of operation of the system, and means for comparing the level of operation of the system to the reference source.... | 01/15/1991 |
| 4983955 | Electric power supply circuit monitoring systems Monitoring an electric power distribution circuit having a rated load capacity includes continually sensing an intensity of electric power supplied through that circuit. In response to that sensing a first signal indicating when electric power is supplied... | 01/08/1991 |
| 4951171 | Power supply monitoring circuitry for computer system A computer system having a power supply monitoring arrangement employs a number of comparators for detecting whether or not various supply voltages produced by the power supply for use in the computer are above or below a reference level, or whether an ov... | 08/21/1990 |
| 4945341 | Alarm system for electrical devices A transmitter having a normally conductive transistor is connected to a wire or other conductor wrapped around the power cord of an electrical device. Because the wire is wrapped around the power cord of the device, it senses the AC radiation generated by... | 07/31/1990 |
| 4931778 | Circuitry for indicating the presence of an overload or short circuit in solid state relay circuits In a solid state relay circuit using a power semiconductor as the output circuit switching device and having protection against current overload and short circuits, an indicator circuit for signaling that overload currents have occurred in the switching d... | 06/05/1990 |
| 4904932 | Circuit condition monitor with integrally molded test point socket and capacitive coupling A circuit condition monitoring system for an electrical power distribution system includes a system connector component having an integrally molded test point socket within which a circuit module is received to provide fault current or voltage loss monito... | 02/27/1990 |
| 4896254 | Protective power controller A power controller system for providing electrical power to a multiplicity of loads at outputs thereof under direction of a plurality of input controllers operating a corresponding plurality of output energization means with the controllers capable of hav... | 01/23/1990 |
| 4890188 | Solenoid driver system A solenoid driver system drives a solenoid, such as a solenoid in a glue applicator or any like apparatus incorporating a solenoid, and which requires control of the solenoid in response to a signal voltage. The solenoid driver system generates a turn on ... | 12/26/1989 |
| 4881028 | Fault detector A new type of immersible fault detector which includes a magnetic coupling link that can be coupled to a power line and a detector receives energy proportional to the load currents flowing in the power line and energizes a light source. A fiber-optics lig... | 11/14/1989 |
| 4875152 | Electrical tap switch An electrical tap switch is provided that allows a user to control two power outlets. In one embodiment the tap switch is used in-line between one extension cord and two additional ones. In another embodiment the tap switch is plugged directly into a wall... | 10/17/1989 |
| 4858141 | Non-intrusive appliance monitor apparatus A non-intrusive monitor of energy consumption of residential appliances is described in which sensors, coupled to the power circuits entering a residence, supply analog voltage and current signals which are converted to digital format and processed to det... | 08/15/1989 |
| 4841281 | Apparatus for controlling a switching amplifier An apparatus for controlling the output of a switching amplifier includes a signal dividing circuit which generates a delayed replica of the carrier signal and a doubled signal having twice the carrier frequency. The doubled signal is effective for establ... | 06/20/1989 |
| 4839770 | Control circuit with validity-determining arrangement An arrangement is provided for checking the validity of a sensed-current signal from a current-sensing device. The sensed-current signal represents the current in a line. An associated control circuit utilizes the sensed-current signal to indicate or pred... | 06/13/1989 |
| 4831364 | Drilling machine A drive motor connected to a drill bit serves to actuate the drill bit. An electric current is allowed to flow through the drive motor to activate the drive motor. A mechanism serves to feed the drill bit with respect to a workpiece. The current flowing t... | 05/16/1989 |
| 4825199 | Circuit underloading monitoring system An improved system for the detection of underloading in an electrical heating circuit where monitoring is available in proximate and remote locations. Circuit monitoring is augmented by control devices which activate alarms in visual or audible form when ... | 04/25/1989 |
| 4797661 | Motion sensing device This invention relates to a device adapted to sensing motion when powered by passage of an electric current between two electrodes that is comprised of a container partially filled with an electrically conductive liquid along with two electrodes in contac... | 01/10/1989 |
| 4794332 | Fault indicator having improved trip inhibit circuit A fault indicator for indicating the occurrence of a fault current in a monitored conductor includes an electrically actuated indicator flag. Trip circuitry within the fault indicator conditions the indicator flag from a normal reset-indicating state to a... | 12/27/1988 |
| 4794329 | Cable mounted capacitively-coupled circuit condition indicating device A device for indicating a circuit condition such as the occurrence of a fault current in a high voltage conductor from which the indicator device is suspended includes a housing having at the upper end thereof a pair of outwardly projecting cable engageme... | 12/27/1988 |
| 4782422 | I2 t monitoring circuit An I2 t monitoring circuit utilizes a multiplier to provide a signal that is representative of the squared value of a monitored current. The squared signal minus a DC level is provided as an input to a voltage-to-frequency converter and the out... | 11/01/1988 |
| 4767280 | Computerized controller with service display panel for an oil well pumping motor An apparatus for controlling and monitoring an electrical motor used to pump petroleum from beneath the surface of the earth. A computerized metering apparatus is used to monitor overload power, underload power, as well as other conditions. When the deman... | 08/30/1988 |
| 4760379 | Fail-safe high temperature alarm A temperature sensor located at a region being monitored controls an output switch that in one position when ambient temperature is below a predetermined temperature applies current to only a first loop circuit and in another position when ambient tempera... | 07/26/1988 |
| 4739326 | Fault flag driver The present apparatus relates to nonvolatile fault flags for use in aircraft. The term "flag" refers to an electromechanical indicator which displays a human-readable signal which identifies a fault. A fault is a malfunction occurring in the aircraft. The... | 04/19/1988 |
| 4736157 | Wide-range resistance monitoring apparatus and method An inexpensive circuit monitors the resistance between a body (e.g., a static dissipative work surface, a tool, etc.) and ground potential, and compares that resistance with high and low resistance values defining a preset resistance range. An operational... | 04/05/1988 |
| 4714916 | Voltage loss detector A detector for indicating loss of voltage on a monitored conductor includes first and second serially connected capacitors, and a rectifier circuit which derives operating power from the monitored conductor to charge the capacitors in the presence of volt... | 12/22/1987 |
| 4706561 | Printing activator test circuit generating back EMF Detecting the inoperability of a plurality of printing element drivers without printing involving sequentially energizing each of the drivers with a shortened time duration pulse sufficient to produce a signal in indicating operability and/or inoperabilit... | 11/17/1987 |
| 4696785 | Testable voted logic power circuit and method of testing the same In a protection system for a complex process control system which generates three independent actuation signals, the power circuit includes three pairs of switches arranged in three groups connected in series with each other and with a load device and a v... | 09/29/1987 |
| 4695793 | Resistive sensing thermal device for current measurement A thermal transfer device for use in the measurement of alternating current comprising an evacuated enclosure containing a first electrical conductor heated by the alternating current being measured and a thermal sensor to provide an electrical signal rep... | 09/22/1987 |
| 4686518 | Fault indicator having trip inhibit circuit A fault indicator includes a status indicator for indicating normal and fault conditions on a monitored conductor. Trip circuitry within the fault indicator conditions the status indicator from a normal-indicating to a fault-indicating state upon the occu... | 08/11/1987 |
| 4684932 | Method and arrangement for measuring changes of capacitive state at a security fence At a security fence comprising a plurality of electrodes disposed in parallel, a transmitter applies an alternating voltage to at least one of the electrodes. Remaining electrodes are grounded as receive electrodes. An ammeter measures electrode current a... | 08/04/1987 |
