Celebrity Inventors
Mark Twain (Samuel L. Clemens) received Patent No. 121,992 for "An Improvement in Adjustable and Detachable Straps for Garments." He later received two more patents: one for a self-pasting scrapbook and one for a game to help players remember important historical dates.
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| Number | Title | Issue Date |
| 5345042 | Elevator hitch load weighing tare compensation In an elevator hitch load weighing assembly, a load cell provides an analog load signal to a summer 12, where an analog tare compensation signal is subtracted from the load signal prior to a compensated load signal being provided to an analog-to-digital c... | 09/06/1994 |
| 5343003 | Recalibration of hitch load weighing using dynamic tare A single load cell 10 both (A) measures the load on a elevator hitch providing an analog elevator load signal on line 11 to an analog-to-digital converter 20 via line 18, for providing a digital elevator load signal and (B) is used for providing a dynamic... | 08/30/1994 |
| 5325036 | Elevator speed sensorless variable voltage variable frequency induction motor drive During motor jerk-out, the real component of a stator current ReI is measured as an approximation to torque current IT, and a reference acceleration Aref is obtained as an approximation to the motor acceleration, for providing, by me... | 06/28/1994 |
| 5321216 | Restraining elevator car motion while the doors are open The invention is directed to a safety circuit which detects when the car is at least a predetermined distance away from a floor landing while a car door is open. The safety circuit, upon detection of this condition, activates a solenoid located on a safet... | 06/14/1994 |
| 5316121 | Escalator missing step detection An induction proximity sensor 26 is wider than a normal gap between moving escalator steps 10, 12 so that the inductive proximity sensor 26 is always in front of one step or another and provides a constant signal, when steps 10, 12 are passing the inducti... | 05/31/1994 |
| 5306882 | Measuring elevator hoistway position using audible signals A microphone 13 is provided upon the ceiling 4 of an elevator hoistway 3 and a loudspeaker 8 upon the top of an elevator car 1. A 9-16 kHz up-sweep is provided to the loudspeaker 8 and a sound signal is transmitted from the loudspeaker 8 to the microphone... | 04/26/1994 |
| 5301773 | Positive terminal overspeed protection by rail grabbing A permanent magnet 54 mounted on rods 41 passes vertically over a conductive plate 56 in an elevator hoistway 36, a reactive force causes movement of the permanent magnet 54 vertically away from the conductive plate 56 so that a wedge 24 secured to the ro... | 04/12/1994 |
| 5300739 | Cyclically varying an elevator car's assigned group in a system where each group has a separate lobby corridor Elevator swing cars 37 have doors 50 opening into a low rise lobby service corridor 31 and doors 51 opening into a medium rise lobby service corridor 32 with car panels 52 associated with the low rise group of floors (such as floors 1-13) and car panels 5... | 04/05/1994 |
| 5294875 | Enhanced polyphase motor operation using a solid state inverter A polyphase motor is powered by an inverter. Each phase winding in the motor comprises two electrically insulated, electromagnetically coupled, conductors, making up a "phase bundle." Each conductor in the bundle is powered by its own transistor drive. Th... | 03/15/1994 |
| 5286930 | Variable elevator door dwell time based upon time of notification of assigned car Elevator door dwell time is varied as a function of arrival time so that a show-and-go time is met. The show-and-go time is the time from when the passengers are shown which elevator to board to the time when the elevator door is ready to close after the ... | 02/15/1994 |
| 5272398 | Driver for power field-controlled switches with refreshed power supply providing stable on/off switching Drivers for field-controlled switches are powered and switched on and off by the same combined command and power signal which consists of a command signal modulated by a clock signal forming a command envelope including a train of clock pulses. The invent... | 12/21/1993 |
| 5272288 | Elevator traffic predictions using historical data checked for certainty An elevator system (FIG. 1) employing a microprocessor-based group controller (FIG. 2) communicating with elevator cars (3,4, . . . ) to derive relative prediction values to be used in a scheme of ultimately assigning, e.g., cars to hall calls at a plural... | 12/21/1993 |
| 5241142 | "Artificial intelligence", based learning system predicting "peak-period" t i The present invention is directed to an elevator dispatching system for controlling the assignment of elevator cars. More particularly, the present invention is directed to a method of determining the commencement and/or conclusion of UP-PEAK and DOWN-PEA... | 08/31/1993 |
| 5223680 | Measuring elevator car position using ultrasound Two ultrasonic transducers are provided, one upon the ceiling of an elevator hoistway and the other one the top of an elevator car for measuring the time for an ultrasonic signal to travel from one transducer to another and return for treasuring elevator ... | 06/29/1993 |
| 5206802 | Blanking interval voltage deviation compensator for inverters and converters The invention is used in a voltage conversion bridge for use in converting an AC voltage to a DC voltage or inverting a DC voltage into an AC voltage. In a three-phase bridge having one of three reference phase voltages UA or UB or U... | 04/27/1993 |
| 5183981 | "Up-peak" elevator channeling system with optimized preferential service to high intensity traffic floors The present invention is directed to the grouping of contiguous floors in a building into sectors. According to the present invention, historical information regarding the number of passengers arriving at each floor is obtained and used to predict the num... | 02/02/1993 |
| 5172782 | Pivot mount of elevator load-weighing at car hitch The invention weighs an elevator car independently of variations in load distribution within the car and variations in the tension distribution in rods and ropes from which the car is suspended. This is accomplished by means of a top hitch plate, a middle... | 12/22/1992 |
| 5168133 | Automated selection of high traffic intensity algorithms for up-peak period During up-peak, a dispatcher selecting method chooses among three dispatching algorithms: (i) an up-peak sectoring scheme triggered when two cars leave the lobby fully loaded, (ii) static sectoring, and (iii) dynamic sectoring, in response to any of three... | 12/01/1992 |
| 5168136 | Learning methodology for improving traffic prediction accuracy of elevator systems using "artificial intelligence" A computer controlled elevator system (FIG. 1 ) using prediction methodology to enhance the system's elevator service, having "learning" capabilities to adapt the system to changing building operational characteristics, including signal processing means f... | 12/01/1992 |
| 5153390 | Method for avoiding terminal landing position initialization after power loss In an elevator system, primary marking means, placed near every floors and secondary marking means placed near alternate floors are read by a scanner. Upon scanning, a marking number signal is provided indicating whether a primary marking means and second... | 10/06/1992 |
| 5153821 | Pulse-width-modulation method for providing extended linearity, reduced commutation losses and increase in inverter/converter output voltage A voltage conversion device, whether for inversion, or conversion includes a pulse-width-modulator and a three-phase bridge, each leg of the bridge has a pair of complementary switches (S1/S1*, S2/S2*, S3/S3*). One of the switches S1, S2 or S3 (S1*, S2* o... | 10/06/1992 |
| 5137119 | Adaptive digital armature current control method for ward-leonard elevator drives using an SCR generator field converter A current regulator phase controls a power signal to control silicon controlled rectifiers arranged in a bridge. The silicon controlled rectifiers excite a generator field of an elevator drive. Discontinuity in the generator field current, caused by the i... | 08/11/1992 |
| 5040640 | Piezoresistive elevator button A piezoresistive elevator button assembly comprises a polymer film piezoresistive element sandwiched between a button and a button pressure plate, and circuitry for sensing a change in the resistance of the piezoresistive element. The piezoresistive eleme... | 08/20/1991 |
| 4995478 | Start compensation device for elevators An elevator starting compensation device for performing starting compensation with addition of a load detection signal and a torque command signal comprising a speed command circuit, an automatic speed regulator amplifier for outputting the torque command... | 02/26/1991 |
| 4994951 | PWM inverter control unit The present invention is achieved with a control unit for a PWM inverter for comparing (8) a voltage command signal (7) with the fundamental of the inverter's output voltage waveform and for comparing (11) the result with a carrier signal (10) and using t... | 02/19/1991 |
| 4987320 | Multiphase multiplier A multiphase multiplier circuit employs analog switches, each of which is duty controlled for multiplying input voltage signal with a multiplier determined depending on the duty cycle ON/OFF period. The multiphase multiplier circuit further includes means... | 01/22/1991 |
| 4986391 | Elevator load weighing In an elevator system, sensors 14, 15 are placed at points of inflection 11 on suspension rods 3, 5 in an elevator pendulum car support assembly 1 for the purpose of measuring weight. Sensors placed at such points of inflection measure the tension in the ... | 01/22/1991 |
