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| Number | Title | Issue Date |
| 4908537 | Pole ventilation of radially ventilated rotors Methods and apparatus for reducing noise in a radially ventilated rotor of a dynamoelectric machine are provided by slots formed in the pole regions of the rotor. Members formed of a selected magnetic material, having longitudinally extending ventilating ... | 03/13/1990 |
| 4687621 | Nuclear fuel assembly with improved spectral shift-producing rods An improved spectral shift-producing rod in a fuel assembly of a nuclear reactor has an elongated hollow tubular body with a pair of end plugs attached to its opposite ends to hermetically seal the rod. A burnable poison material is contained in the hollo... | 08/18/1987 |
| 4181838 | Actuating mechanism with an auxiliary switch for an electrically lockable power switch An improved actuating mechanism is provided for a power switch that includes a "tripped" position intermediate an "on" position and "off" position. The mechanism includes an auxiliary switch and improved cam operating means for operating the switch.... | 01/01/1980 |
| 4163131 | Dual-compression gas-blast puffer-type interrupting device A fluid-blast circuit-interrupter of the puffer-type is provided having two connected piston structures, one designated herein as a primary piston structure, and the other termed a secondary piston structure, connected serially mechanically in tandem seri... | 07/31/1979 |
| 4151385 | Turning grip drive for rocker-arm actuated power switch An improved switch operating mechanism comprises a rotary type lever for operating a toggle switch lever or slide switch lever with improved means for coupling the levers.... | 04/24/1979 |
| 4139752 | Gas-type circuit-breaker An improved gas-type circuit-interrupter is provided having a pair of separable contacts, which establish an arc upon separation within a confined casing having a nozzle structure. The arrangement is such that during the initial portion of the opening ope... | 02/13/1979 |
| 4139753 | Puffer-type compressed-gas circuit-interrupter having improved separable contact structure An improved puffer-type, compressed-gas, circuit-interrupter is provided having an improved separable contact structure with resilient stationary contact fingers biased inwardly upon the movable tubular venting arcing contact, the latter moving with a mov... | 02/13/1979 |
| 4139751 | Puffer-type compressed-gas circuit interrupter An improved puffer-type gas-blast circuit-interrupter is provided having a movable operating cylinder assembly movable over a relatively-fixed piston structure. A high compression ratio is obtained during the opening operation by minimizing the "dead" vol... | 02/13/1979 |
| 4131775 | Compressed-gas circuit-interrupters of the puffer-type having improved supporting, shielding and assembly features An improved compressed-gas puffer-type circuit-interrupter is provided having improved supporting, shielding and assembly features for making ready provision for a separate bench subassembly of the gas-interrupter module, and enabling its ready applicatio... | 12/26/1978 |
| 4123618 | Vapor-cooled terminal-bushings for oil-type circuit-interrupters An improved vapor-cooled terminal-bushing is provided for increased current-carrying capacity, such as 6,000 amperes, for example, in an oil-type circuit-breaker, being provided with a "dry" body portion, utilizing resinous materials, such as epoxy-resin ... | 10/31/1978 |
| 4123635 | Multi-pole high-voltage circuit-interrupter having independent pole tripping with a single common operating mechanism A multi-pole high-power circuit-interrupter is provided having a single common operating mechanism therefor, and having independent pole tripping operation by associating with at least one of a plurality of the pole-units its independent ball latching mea... | 10/31/1978 |
| 4123636 | Double-flow puffer-type single-pressure compressed-gas circuit-interrupter An improved puffer-type compressed-gas circuit-interrupter is provided having double-flow gas-flow conditions occurring in opposite directions within the arcing region, and providing thereby adaptability for high-current interrupting duty. Additional feat... | 10/31/1978 |
| 4121186 | Indicating sectional composite fuse construction using standard-type fuse link An indicating sectional two-part fuse is provided having a high-current current-limiting section, and a low-current expulsion section, mechanically connected together, and in electrical series, the low-current section utilizing a standard-type fuse-link, ... | 10/17/1978 |
| 4121075 | Double-break puffer-type compressed-gas circuit-breaker A double-break puffer-type compressed-gas circuit-interrupter is provided having a common piston-and-cylinder arrangement for simultaneously forcing a blast of compressed gas through suitably-disposed jet apertures into a pair of serially-established arcs... | 10/17/1978 |
| 4017217 | Overspeed protection system A protection system to prevent the failure of a flywheel caused by an overspeed condition of a fluid pump. A positive displacement pump is coupled to, and driven by, the drive shaft of the fluid pump, and the positive displacement pump circulates a fluid ... | 04/12/1977 |
| 3991391 | Circuit interrupter with electromagnetic opening means A circuit interrupter characterized by a movable contact arm disposed between two spaced stationary contacts which arm is movable to the open position by electromagnetic forces generated by an overload current condition.... | 11/09/1976 |
| 3989990 | Feedback field control for an electric vehicle An electric vehicle having a separately excited field controlled direct current drive motor powered by a direct current power supply wherein field current is pulse-width modulated in response to operator control and the vehicle operating parameters. An ar... | 11/02/1976 |
| 3980850 | Vacuum interrupter with cup-shaped contact having an inner arc controlling electrode A vacuum interrupter is described having improved electrodes. The electrodes are of the cup-shaped type with an insert electrode disposed within the cup-shaped contact closely spaced from the base portion of the cup. The insert electrode has spiral or rad... | 09/14/1976 |
| 3977704 | Pipe coupler A pipe coupler utilized for connecting two sections of pipe to prevent the escape of gas from within the pipe through the joint therebetween. An annular coupling member comprises two end sections and an intermediate section therebetween, with the two end ... | 08/31/1976 |
| 3975254 | Forward-reverse pulse cycling anodizing and electroplating process power supply A forward-reverse pulse cycling anodizing and electroplating process power supply wherein the forward-reverse cycle time, the ratio of positive to negative pulses during the cycle time, the width of the individual pulses and the voltages of the pulses are... | 08/17/1976 |
| 3967196 | Method and apparatus for measuring the void content of a solid dielectric A circuit modification of a capacitance bridge is provided to measure void content of high voltage electrical insulation. A sample of the insulation under investigation is disposed as the capacitor dielectric in one leg of a capacitance bridge. Signals pr... | 06/29/1976 |
| 3960554 | Powdered metallurgical process for forming vacuum interrupter contacts A powdered metallurgical procedure for forming chromium copper contacts used in vacuum interrupters, wherein by adding a small amount of copper powder to the difficult-to-press chromium powder, superior pressed properties are attained and a resulting chro... | 06/01/1976 |
| 3959753 | Circuit interrupter with load side short circuit A circuit interrupter protective device characterized by a two-level current limiting structure which provides current limiting on the main or supply side of the current limiter to one level of the peak let through current and to a much lower level on the... | 05/25/1976 |
| 3959754 | Circuit breaker with improved trip means An improved circuit breaker comprises a thermal trip that comprises a current carrying bimetal, and a magnetic trip that comprises a magnetic yoke and armature supported on the bimetal with a multi-turn energizing coil supported on the yoke to enhance the... | 05/25/1976 |
| 3959692 | Monitor and controller for heating a resistive element Apparatus for controlling the heating of an electric element which repeatedly disconnects the electric element from the heating power supply and connects a resistor in series with the electric element and an electric potential across the series combinatio... | 05/25/1976 |
| 3956574 | Busway insulation system An elongated section of bus duct having U-shaped insulating pieces surrounding the longitudinally extending edges of the stacked bus bars and a flat insulating sheet of a material which does not adhere to the U-shaped insulating pieces disposed between th... | 05/11/1976 |
| 3950715 | Circuit breaker with improved trip means A circuit breaker comprises improved thermal and electromagnetic trip means comprising a currrent carrying bimetal operable upon the occurrence of lesser overloads to effect time-delay thermal tripping operations, and electromagnetic means energized by th... | 04/13/1976 |
| 3939398 | Indicator lamp circuit having feedback protection A circuit, having protection against current feedback when a component fails, for testing indicator lights whereby multiple lights may be tested simultaneously by pressing one pushbutton and closing one set of normally open contacts. The test pushbutton a... | 02/17/1976 |
