Did You Know...
...that in the early 1940s GE engineer James Wright was charged with a task of utmost importance to the war effort: develop a cheap substitute for rubber that could be used to produce tires, gas masks and a whole host of military gear. Wright tackled the task diligently -- and wound up inventing Silly Putty.
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| Number | Title | Issue Date |
| 7935907 | Contact system for a short-circuiting device in a medium-voltage or high-voltage switchboard plant A contact system for a short-circuiting device for a switchboard, the contact system including at least one fixed contact piece connected to a main voltage source. The contact system also includes at least one moving contact piece and an insulating screen penetrable... | 05/03/2011 |
| 7397012 | High current switch and method of operation An electrical switch which includes an insulative housing having a wall defining an axial bore therein, a first electrical contact disposed in the housing bore and a second electrical contact movably disposed in the housing bore between an open position and a closed... | 07/08/2008 |
| 7176771 | Circuit breaker filter assembly An improved filter assembly for a circuit breaker includes a generally rectilinear filter housing having at least two filter mounting zones for receiving at least two filter assemblies, so as to define, in the aggregate, a filter assembly, and at least two filter as... | 02/13/2007 |
| 6929064 | Downhole pump There is disclosed an improved pump (5, 5′) particularly suitable for use in a method of “artificial lift” in an oil/gas well. Known pumps used in artificial lift methods suffer from a number of problems/disadvantages—e.g. low efficiency (hydraulic ef... | 08/16/2005 |
| 6797909 | High-voltage loadbreak switch with enhanced arc suppression A high-voltage loadbreak switch operates submersed in a dielectric fluid and may be configured to switch one or more phases of power using one or more phase switches. Each phase switch may include first and second stationary contacts. The first stationary contact ma... | 09/28/2004 |
| 6414256 | Current limiting circuit breaker The present invention provides a current limiting circuit breaker having a current responsive device for opening a pair of contacts or switch upon short circuit conditions. The current responsive device utilizes an insulating object driven by a magnetic f... | 07/02/2002 |
| 6414839 | Shutter mechanism for vertical bus of motor control center A compact automatic shutter mechanism in an electrical enclosure provides enhanced protection against inadvertent electrical contact for personnel working within and around the electrical enclosure, and also makes it possible to install more equipment in ... | 07/02/2002 |
| 6331685 | Mounting system for a circuit breaker A mounting system for a circuit breaker comprising: a mounting box; an angular mounting plate, including a planar portion retained to a mounting wall of a mounting box, and an angular portion at about 200° in which a circuit breaker body is retained; a m... | 12/18/2001 |
| 6281460 | Load break interrupter having diagonally split case with component mounting elements A load break interrupter includes a case, an arc-suppressing tube mounted on and projecting outwardly from the case, a shunt circuit rod slidably supported in the tube with the rod and tube having electrical contacts mounted thereto and convertible betwee... | 08/28/2001 |
| 6215082 | Load break interrupter having vented muffler assembly on arc-suppressing tube A load break interrupter includes a case, an arc-suppressing tube mounted on and projecting outwardly from the case, a shunt circuit rod slidably supported in the tube with the rod and tube having electrical contacts mounted thereto and convertible betwee... | 04/10/2001 |
| 5780800 | Circuit breaker contact arm and spring shield An arc isolation shield for molded case circuit breakers is inserted between the circuit breaker case and cover and attached to one leg of the operating cradle. The knee of the circuit breaker moveable contact arm contacts the bottom of the shield and mov... | 07/14/1998 |
| 5761025 | Low cost power switchgear There is described a novel arc extinction method for use in switchgear, and improved, low cost power switchgear incorporating the novel arc quenching method. By physically severing the arc and the substantially simultaneous interposition of a high dielect... | 06/02/1998 |
| 5550707 | Low cost power switchgear There is described a novel arc extinction method for use in switchgear, and improved, low cost power switchgear incorporating the novel arc quenching method. By physically severing the arc and the substantially simultaneous interposition of a high dielect... | 08/27/1996 |
| 5197604 | High-voltage change-over switch with linear movement A change-over switch comprises four input terminals connected in pairs to one of the two poles +HT and -HT of a high voltage generator and four output terminals connected in pairs to one of two X-ray tubes. It includes two identical half change-over switc... | 03/30/1993 |
| 4532499 | Means for detecting the contact wear of electrical switching devices In a means for detecting the wear of a current interrupting contact (4) there is used a light conductor (12) as a connecting link between the contact (4) and a detector (20) arranged at ground potential. The light conductor is inserted into an aperture (1... | 07/30/1985 |
| 4521653 | Circuit breaker with arc light absorber The present invention relates to a circuit breaker with an arc light absorber comprising: a pair of electric contactors contained in an insulating container for opening or closing an electric circuit, electric conductors forming said electric contactors a... | 06/04/1985 |
| 4491707 | Electrical contact assembly for a current interrupting unit A female interrupting contact for a current-interrupting unit includes a smoothly contoured, apertured pressure ring which is held in a groove formed in the wall of a bore through a contact body. A flat spring in the groove maintains the ring to one side ... | 01/01/1985 |
| 4491708 | Electrical contact for use in a current interrupting unit A female interrupting contact for a current-interrupting unit includes a smoothly contoured, apertured pressure ring which is held in a groove formed in the wall of a bore through a contact body. A flat spring in the groove maintains the ring to one side ... | 01/01/1985 |
| 4418256 | Electrically insulating plastic element for an electrical switching device, especially for use as the blast nozzle of a gas-blast switch A plastic mass of a blast nozzle contains a filler which is at least partially composed of powder of one or more metals. The proportion of metal powder amounts to at most 30 percent by weight, preferably 5 to 15 percent by weight. As the filler there is p... | 11/29/1983 |
| 4268811 | Circuit interrupting device A circuit interrupting device is disclosed. A stationary contact is mounted within a stationary hollow insulator and connected to one side of an electrical circuit. A movable contact normally engages the stationary contact and is mounted for movement with... | 05/19/1981 |
| 4253002 | Self-extinguishing type circuit interrupter A circuit interrupter comprising a first and a second chamber both containng an arc extinguishing gas such as SF6 gas, each chamber defining a space independent of the other when a pair of contacts is closed. Between the first and second chambe... | 02/24/1981 |
| 4228333 | Circuit interrupter having controlled rate of arc extinguishment A circuit interrupter comprises a pair of contacts being relatively moved to be detachable in an arc extinct chamber filled with a fluid for arc extinction; a pressurizing chamber for storing the fluid pressurized in an arc space in which the arc is forme... | 10/14/1980 |
| 4052555 | Gaseous dielectric compositions Perfluorinated ethers evidence useful properties as gaseous dielectrics and do not exhibit a high carbon tracking tendency, which is commonly a problem with halogenated alkanes. Mixtures of the perfluorinated ethers with SF6 and/or CO2 | 10/04/1977 |
| 4048610 | Electric protective device and process of manufacturing the same An electric protective device capable of handling both short-circuit currents and minor overload currents of impermissible duration. The device for interrupting small overload currents of impermissible duration includes a cylinder, a plunger inside said c... | 09/13/1977 |
