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.
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| Number | Title | Issue Date |
| 7209048 | Device for monitoring and alerting of a power disruption to electrical equipment or an appliance The present invention is a simple, inexpensive and reliable device for monitoring and alerting of a power disruption to an appliance or a piece of equipment. An audible and/or visual alarm may be generated in the event that a specific or a piece of electrical equipm... | 04/24/2007 |
| 6909203 | I/O interface anti-resonance passband shunting technique A method and apparatus for regulating resonance in a computer system I/O interface is provided. A shunting impedance/resistance is arranged across a power supply of the I/O interface. The shunting impedance/resistance is controlled by circuitry that is arranged to d... | 06/21/2005 |
| 6784571 | Electronic safety switching device and method The present invention relates to an electronic safety switching device having at least a first and a second signal processing channel. The channels can be supplied with input signals for signal processing, and they provide redundantly processed output signals. Accor... | 08/31/2004 |
| 6690565 | Method and apparatus for neutralizing stray current impulses The attenuation of the stray current impulse limits the capacitive leakage. The value of the inductance, coupled to the parasitic capacitance of the charge, creates a reactive filter effect. Since the effect is reactive, the impulse energy is not absorbed... | 02/10/2004 |
| 5760499 | Safety device for socket which is connected to electrical power supply A safety device includes a comparator circuit includes three resistors arranged in series. An IC has a positive pole coupled to the resistors and has a negative coupled to the positive pole of another IC which has a negative pole coupled to the resistors.... | 06/02/1998 |
| 5321318 | Stray current neutralizing method and device A method and device neutralize alternating stray current flowing through a ground return circuit in the proximity of an animal susceptible to be affected by this current. The alternating stray current flowing through the ground return circuit is sensed an... | 06/14/1994 |
| 4967302 | Safety barriers for 2-wire transmitters A single-channel shunt-diode safety barrier for energizing a 2-wire transmitter, particularly for use in process control, incorporates within the barrier a floating d.c. power supply or its equivalent to enable the barrier to deliver into an earthed load ... | 10/30/1990 |
| 4816956 | Stray voltage reduction apparatus Stray voltage reduction apparatus for installation in an electrical power system to complete a path of electrical continuity between a primary neutral of a power distribution transformer and a grounding conductor at a service entrance, the primary neutral... | 03/28/1989 |
| 4743998 | Grounding system An improved grounding system comprises a tube which is vertically buried under the ground and cut with a plurality of holes at its lower part, and receives a wire inside it. The wire connects at its top with a set of current leakage detector that alarms a... | 05/10/1988 |
| 4703195 | Parallel grounding scheme Electronic system grounding includes two system grounding paths for card cage electronic modules, with a first grounding path through the card cage and a second grounding path through the system power supply. The two system grounding paths are used to min... | 10/27/1987 |
| 4670663 | Guarded switches for component scanner A test voltage is applied through an array of "guarded" switches (58) to selected ones of a plurality of components to be measured. Each switch (58) comprises first and second input terminals (69, 72), first and second output terminals (70, 74), and a wir... | 06/02/1987 |
| 4573098 | Ground voltage suppression In a power supply system having a grounded neutral and supplying service equipment through a distribution transformer, a ground voltage suppression device comprises a saturating inductor or like non-linear impedance device connected between the secondary ... | 02/25/1986 |
| 4428018 | Low leakage filtered power supply An AC power supply system having transformer and filter structures. The electrical center of the filter section, which is normally connected to system ground, floats with respect to system ground and is connected to a center tap on the secondary winding o... | 01/24/1984 |
| 4415775 | Arrangement for exchanging signals between separated circuits Arrangement for transmitting at least two signals from a first circuit arrangement to a separate second circuit arrangement. In order to realize a disturbance-independent signal transmission with a small number of signal conductors, one signal conductor w... | 11/15/1983 |
| 4371825 | Method of minimizing the effects of parasitic currents A method of minimizing the effect of parasitic currents in secondary batteries having a plurality of cells connected electrically in series and a common electrolyte in communication with the cells is described. Specifically, the parasitic currents flowing... | 02/01/1983 |
| 4367507 | Apparatus for clearing faults on untransposed transmission lines using single phase switching A switched four-legged reactor bank which operates in combination with line circuit breakers can be used to extinguish faults on untransposed transmission lines. It comprises three shunt reactors, a neutral reactor and three switches for performing high s... | 01/04/1983 |
| 4051827 | Selective threshold ignition circuit A selective threshold ignition circuit adaptable for use in an electronic ignition system for an engine is disclosed. A magnetic pick-up produces an AC signal about a DC reference level which has a frequency related to the rotational movement produced by ... | 10/04/1977 |
