Celebrity Inventors
Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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 |
| 7848067 | Soft start motor control using back-EMF A method of controlling in-rush current to a DC motor is disclosed. The method may include operating the DC motor in a first mode including applying back-EMF across a relay coil to maintain the relay in an open configuration when the back-EMF is below a predetermine... | 12/07/2010 |
| 7706111 | Motor lock detection circuit A motor lock detection circuit for detecting lock of a motor, comprising: a binarizing circuit to binarize a signal, obtained from the motor, having a frequency corresponding to rotation speed of the motor, to generate a binary signal; an edge detecting circuit to g... | 04/27/2010 |
| 7688557 | Control apparatus for transmission mechanism, transmission, vehicle provided therewith, method of controlling the transmission mechanism, and method of estimating heat value of electric motor in the transmission mechanism A motorcycle has a transmission including a transmission mechanism and an electronic control unit (ECU). The transmission mechanism includes a crankshaft as an input shaft, a driven shaft as an output shaft and an electric motor. The electric motor changes continuou... | 03/30/2010 |
| 7656625 | Disc apparatus A disc apparatus which can accurately judge whether or not a spindle motor is at fault due to a short circuit is provided. A disc apparatus (1) includes a spindle motor (3) which rotates a disc (2), a differential operational amplifier ( | 02/02/2010 |
| 7518837 | Control device for soft starting and protecting overload of motor A control device for soft starting and protecting overload of a motor in a power tool is disclosed. The control device comprises a power switch, a varistor, several diodes, several resistors, several capacitors, a relay, a transistor, a triac, and a microcontroller.... | 04/14/2009 |
| 7359166 | Method and control system for controlling electric motors There is described a method for controlling an electric motor comprising an operating relay having relay windings with respective first and second relay contacts and a control means, which motor via current conductors is connected to said relay and a power source wh... | 04/15/2008 |
| 7342276 | Method and apparatus utilizing monocrystalline insulator A semiconductor device, including: a semiconductor material; a conductive element; and a substantially monocrystalline insulator disposed between the semiconductor material and the conductive eleme... | 03/11/2008 |
| 7265954 | Method for estimating DC motor coil temperature, DC motor control method and their devices Resistance of the coil of a DC motor is calculated by using the motor current and the motor voltage, and the coil temperature is estimated by using the resistance-temperature characteristics of the coil. ... | 09/04/2007 |
| 7245198 | Motor start relay and an electric compressor using same A motor start relay (100) comprises a positive temperature PTC thermistor, a PTC case 400 of heat resistant resin for receiving the PTC thermistor horizontally, first and second contact/terminals (500, 560) each having contacts electrically enga... | 07/17/2007 |
| 7242562 | Fan protection method and apparatus The present invention discloses a fan protection apparatus and related method thereof. The fan protection apparatus has a control circuit and a counter. According to the fan protection method, the user can set the acceptable restart number and the special time for a... | 07/10/2007 |
| 7208909 | Motor protection inhibit circuit A circuit for inhibiting a protection device of a motor includes first, second, and third comparators and an inhibit signal generator. The first comparator is operable to determine if a motor current signal associated with the motor exceeds a starting threshold to i... | 04/24/2007 |
| 7121773 | Electric drill apparatus An electric drill apparatus having a low profile is provided which comprises an annular cutter, a motor for rotating the annular cutter, a rotary shaft assembly for rotating the annular cutter attached to its leading end about a rotating, a rotation reduction mechan... | 10/17/2006 |
| 7107957 | Protected control apparatus A control apparatus for protected switching of a load encompasses at least two switch units in series with a load, to permit delivery of energy to a load when each switch unit is switched on and to block it when at least one of the switch units is shut off; an elect... | 09/19/2006 |
| 7038895 | Apparatus for detecting abnormality of relay An abnormality detection apparatus, which reduces erroneous detection of an open abnormality of a relay, includes a microcomputer that activates the relay and determines whether the output voltage of the relay is less than a threshold value. When the output voltage ... | 05/02/2006 |
| 7005827 | Starting circuit for single-phase induction motor A starting circuit for a single-phase induction motor includes a motor starting positive characteristic thermistor and a triac arranged in a series connection, and a triac control positive characteristic thermistor connected in parallel with the motor starting posit... | 02/28/2006 |
| 6946967 | Protective device for an electric motor with sensor and evaluation unit A protective device includes a signal input intended for connection to a sensor, a signal output intended for connection to an evaluation unit, and an isolation element for galvanically separating the signal input from the signal output. The provision of the protect... | 09/20/2005 |
| 6590752 | Electronic control device An electronic control device has a power switch for driving and supplying an electrical drive for a fitting which is to be controlled. The invention provides for the power switch to be driven by an electronic computer assembly arranged inside the housing ... | 07/08/2003 |
| 6456034 | Device for controlling the power supply of an electric starter motor of a motor vehicle and a starter unit containing such a device In a device for controlling the power supply of the electric motor of a starter of a motor vehicle, and of an automobile in particular, a power switch is connected in series with the electric motor to control the motor power. The switch consists of an ele... | 09/24/2002 |
| 6331821 | Combination current sensor and relay A combination current sensor and relay has an improved housing. In one aspect, the housing includes light emitting diodes on an upper surface that indicate open circuit and short circuit conditions. In another aspect, the housing includes a securement str... | 12/18/2001 |
| 6327124 | Low current ground fault relay A ground fault relay, especially useful to detect motor leakage currents due to insulation failure. The invention operates in two (2) modes. The first mode is a "look-ahead" mode where possible motor circuit insulation failure is detected prior to the ele... | 12/04/2001 |
| 6252752 | Overload protection apparatus and a speed reducer having such an apparatus A semiconductor switch is installed in a power supply line of a motor, and photocouplers, which constitute a switching control circuit for turning on and off the semiconductor switch, are series-connected between a constant-voltage source and the output e... | 06/26/2001 |
| 6150792 | Phase monitor A phase monitor for a short-circuited asynchronous three-phase motor comprises a first and a second sensing unit, both of which are connected to a supply voltage line to the motor in order to sense the voltage conditions on the line, and a control switch ... | 11/21/2000 |
| 5867357 | Dynamic protection circuit for a motor type load An express down vehicle window lift motor drive system in which an overcurrent detection circuit (10) interprets the flow of electrical power to the lift motor when the motor current exceeds a threshold which is set dynamically as a function of motor in-r... | 02/02/1999 |
| 5847915 | Static isolator Static isolator for the DC supply circuit of a load (MO) in the event of a surge, consisting of a dipole intended to be inserted into the power circuit of the load and comprising means for detecting a surge (R1, R2, T3, CI), means for filtering and storin... | 12/08/1998 |
| 5796565 | Apparatus and method for starting and protecting a three-phase motor Apparatus for protecting and starting a three-phase motor uses the three-phase field rotation torque produced by three voltage coils, connected to a three-phase power supply, spaced 120 degrees apart from each other, acting on an aluminum disk having a li... | 08/18/1998 |
| 5719732 | Overload protecting device An overload protecting device which includes a comparator 11 to which an output voltage V10 in proportion to the current flowing through a motor 5 and a start detecting reference voltage E11 are inputted, and a comparator 13 to which the output voltage V1... | 02/17/1998 |
| 5675896 | Portable electric working machine A portable electric working machine of the present invention includes a motor case portion housing an electric motor, a working portion driven by the electric motor, a handle connected to the motor case portion or the working portion and a power source sw... | 10/14/1997 |
| 5535082 | Turn-on control circuit for electric devices A turn-on control circuit having a comparator supplied with a turn-on voltage increasing gradually during the turn-on phase of a device for protection. When the control voltage reaches a predetermined value, the comparator supplies a diagnostic enabling s... | 07/09/1996 |
| 5491978 | Electronically commutated motor for driving a compressor A system which drives a compressor of a refrigeration system at one or more speeds. The system includes a motor having a stationary assembly and a rotatable assembly. The stationary assembly includes windings adapted to be commutated in at least one prese... | 02/20/1996 |
| 5428493 | Motor starting relay device having PTC thermistors In a relay device, a first PTC thermistor has one end connected to a first external connecting terminal, and the other end connected to one end of a second PTC thermistor, the other end of which is connected to a second external connecting terminal, and t... | 06/27/1995 |
| 5418675 | Protection system for AC generators A circuit for protecting the ac generator and/or load of a diesel-engine generator set is provided. Included is a circuit for measuring indications of the current in each phase of the ac generator, and a switching circuit for protecting the ac generator i... | 05/23/1995 |
| 5339014 | Apparatus for safety monitoring in protective arrangements with normal and enhanced safety of machinery performing multiple-axis rotations In an apparatus for safety monitoring of protective arrangements with normal or enhanced safeguard for machinery performing multiple-axis rotations with shutoff contactors in the power supply section of the machine and an external monitoring circuit for s... | 08/16/1994 |
| 5337206 | Three phase power monitor A three-phase power monitor operates a contactor between a supply of three phase electrical power and a three phase load. A phase integrity detector has three inputs connected respectively to the three phases of the electrical power. If a loss, reversal, ... | 08/09/1994 |
| 5260634 | Constant current driving system for a stepper motor in rotating disk In order to drive the stepper motor of a floppy disk drive with practically constant current in the face of fluctuations in supply voltage fed from a host system, a power control pulse generator circuit is provided which produces a series of power control... | 11/09/1993 |
| 5206776 | Protection system for ac generators A circuit for protecting the ac generator and/or load of a diesel-engine generator set is provided. Included is a circuit for measuring indications of the current in each phase of the ac generator, and a switching circuit for protecting the ac generator i... | 04/27/1993 |
| 5189388 | Oil well pump start-up alarm A visual and audible alarm are connected to a control circuit for an oil well pumping unit. The control circuit includes a time clock which controls the intermittent ON-OFF cycle of operation of the pumping unit in the automatic mode, the OFF portion of t... | 02/23/1993 |
| 4991049 | Anti-short-cycle circuit A protective time delay delay circuit delays energization to an electric load until a predetermined time has elapsed from a previous deenergization. A transistor has its emitter connected to an ac conductor and has its base coupled to an RC timing circuit... | 02/05/1991 |
| 4939909 | Control apparatus for air conditioner An air-conditioner comprises a refrigerating circuit having a compressor, a condenser, an expansion device and an evaporator which are connected by suitable refrigerant conduits. An electric current path for making a current flow through the compressor in... | 07/10/1990 |
| 4933799 | Highly efficient over current circuit breaker A highly efficient over current circuit breaker for an electric system is provided with a timer which is adjustable and can be set to produce a first control signal a predetermined time after the electric system is turned on, and a load detector in associ... | 06/12/1990 |
| 4933800 | Motor overload detection with predetermined rotation reversal An apparatus is provided for controlling an electric motor that is doing some sort of work, whereby the apparatus automatically senses the presence of a work overload. Once the work overload is sensed, the apparatus automatically reverses the direction of... | 06/12/1990 |
