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4069061 |
Ceramics having nonlinear voltage characteristics
Ceramics having nonlinear voltage characteristics in which (1) zinc oxide is used as a main component and (2) praseodymium, (3) one or more of magnesium or calcium, and (4) cobalt are added thereto...
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4068281 |
Thermally responsive metal oxide varistor transient suppression circuit
A temperature responsive resistor is thermally connected to a body of metal oxide varistor material in transient suppression and other applications. In the event of excess energy dissipation in the...
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4064475 |
Thick film varistor and method of making the same
A thick film varistor comprises a varistor film sandwiched between a pair of electrodes, one of which is in contact with a cylindrical substrate. Alternatively, the electrodes may be positioned on...
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4052340 |
Method for producing a voltage dependent resistor and a voltage dependent resistor obtained therewith
Voltage dependent resistor obtained by sintering a body of a mixture of ZnO and other metal oxides in an atmosphere which contains bismuth.
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4041436 |
Cermet varistors
The cermet varistors have electrodes applied to an improved varistor composition which includes a semi-conductive material having zinc oxide in admixture with at least one metal oxide selected from...
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4038217 |
Ceramics having non-linear voltage characteristics and method of producing the same
A ceramic having non-linear voltage characteristics, comprising the product obtained on mixing (a) zinc oxide, as a principal component, and (b) (1) cobalt and (2) one of neodymium, samarium or...
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4038516 |
Thermal printing head
A thermal printing head provided with a plurality of electric heating members for recording information on a recording material, such as heat-sensitive paper. The heating members are...
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4033906 |
Ceramics having nonlinear voltage characteristics and method for producing same
Ceramics having nonlinear voltage characteristics comprising the product obtained on preparing a mixture of zinc oxide as a main component, and, as subcomponents, cobalt plus one of praseodymium or...
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4003855 |
Nonlinear resistor material and method of manufacture
The zinc oxide grain size and breakdown voltage characteristics of polycrystalline zinc oxide varistors may be controlled by adjusting sintering times and temperatures. Varistor ceramics formed by...
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3996493 |
Fluorescent lamp unit having ballast resistor
An integral self-contained fluorescent lamp unit comprising an elongated lamp and an elongated ballast resistor carried in an outwardly extending housing member positioned alongside the lamp.
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3991340 |
Discharge lamp lighting apparatus including a sintered type oxide negative resistance starting element
A discharge lamp (e.g., fluorescent lamp) lighting apparatus using as the starting element a sintered type oxide resistance element having the voltage-current characteristic that the element is...
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3990098 |
Structure capable of forming a diode and associated conductive path
A diode-forming layered structure comprising a semiconductor body having a layered coating thereon, said semiconductor having a surface region of given conductivity type, said coating being a...
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3976854 |
Constant-temperature heater
A constant temperature heater includes a thermistor having a positive temperature coefficient and a varistor stacked upon one another in an electrically insulating casing in such a manner that the...
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3965330 |
Thermal printer head using resistor heater elements as switching devices
A method and apparatus for a thermal printer head which uses individual heater elements as switching devices is disclosed. The printer head consists of an array of individual resistors each capable...
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3962715 |
High-speed, high-current spike suppressor and method for fabricating same
There is disclosed a spike suppressor which is capable of switching very high currents at very high speeds. Typically, a current in the order of 80 amperes can be switched in less than 1...
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3953371 |
Controlled grain size metal oxide varistor and process for making
Disclosed is a metal oxide varistor consisting primarily of metal oxide with a small percentage of preselected additives distributed substantially evenly therethrough. A grain growth inhibitor is...
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3928242 |
Metal oxide varistor with discrete bodies of metallic material therein and method for the manufacture thereof
Disclosed is a metal oxide varistor and a method for the manufacture thereof. Discrete bodies of metallic matter are combined with a mixture of a metal oxide and at least one preselected additive....
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3926916 |
Dielectric composition capable of electrical activation
A dielectric composition, and layered structure thereof, comprising a dielectric polymeric binder, for example, a polyimide having a glass transition temperature of at least 100°C., and normally...
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3924148 |
Small size DC motors
New small size DC motors comprising as a spark suppressing element a commutator composed of a cylinder-shaped oxide sintered body having a remarkably stable volt-ampere characteristic as a parent...
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3913056 |
Varistors with patterned electrodes
Current channeling through stacks of polycrystalline varistor devices for high voltage surge protection applications is prevented by applying patterned electrodes to the varistor elements of the...
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3913055 |
Photoconductive varistor
A photoconductive polycrystalline varistor comprising a sintered body of zinc oxide and a minor constituent consisting of other metal oxides or halides has a pair of electrodes on one major face...
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3906425 |
Oxide semiconductor-metal contact resistance elements
New oxide semiconductor-metal contact resistance elements having remarkably stable volt-ampere characteristics are provided. The contact resistance elements comprise oxide semiconductors which have...
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3905006 |
Voltage dependent resistor
A voltage dependent resistor which has a zinc oxide sintered body which itself has voltage dependent properties. The resistor is made by the steps of: (1) providing a formed body of a powder...
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3903494 |
Metal oxide varistor with coating that enhances contact adhesion
Disclosed is a metal oxide varistor comprising a body portion consisting essentially of a metal oxide and a small percentage of a plurality of preselected additives. The body portion defines two...
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3872582 |
Process for making a voltage dependent resistor
A process for making a voltage dependent resistor which has a zinc oxide sintered body which itself has voltage dependent properties. The process is made up of the steps of: (1) providing a formed...
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3863193 |
VOLTAGE-NONLINEAR RESISTORS
The invention relates to voltage-nonlinear resistors having nonohmic resistance due to the bulk thereof and more particularly to varistors, which utility as surge absorbers and D.C. stabilizers,...
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3857174 |
METHOD OF MAKING VARISTOR WITH PASSIVATING COATING
Disclosed is a metal oxide varistor comprising a body portion that is composed essentially of a metal oxide and a small percentage of a plurality of preselected additives. A passivating coating is...
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3838378 |
VOLTAGE-NONLINEAR RESISTORS
The invention relates to voltage-nonlinear resistors having nonohmic resistance due to the bulk thereof and more particularly to varistors, are suitable for use as elements of lightning arresters,...
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3836340 |
VANADIUM BASED RESISTOR COMPOSITIONS
Screen printable, air fireable compositions comprising a vanadium glass, boron, and as optional components, noble metal and/or a low melting inorganic binder, wherein the vanadium glass contains...
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3818411 |
METAL OXIDE VARISTOR WITH SELECTIVELY POSITIONABLE INTERMEDIATE ELECTRODE
A metal oxide varistor is disclosed formed of a varistor body having an alpha in excess of 10 in the current density range of from 10 -3 to 10 2 amperes per square centimeter. First and second...
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3805022 |
SEMICONDUCTING THRESHOLD HEATERS
A heat responsive switch for controlling current flow through a zinc oxide varistor heater. The switch in its broadest form can take the form of a thermostatic device or a PTC device positioned...
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3793716 |
METHOD OF MAKING SELF LIMITING HEAT ELEMENTS
A process for manufacturing self-limiting heating elements by casting a semi-conducting composition from solution or fusing a powder. Preferred embodiments of the composition contain conductive...
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3779948 |
VITREOUS COMPOUNDS WITH BISTABLE ELECTRICAL CHARACTERISTICS
A new class of vitreous compounds having bistable electrical characteristics, that is to say, two different states of electric resistance is described. The new class of vitreous compounds can be...
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3777219 |
ELECTROMAGNETIC PULSE SUPPRESSOR
Apparatus is disclosed for protecting electronic circuitry against the damaging and destructive effects of fast rise time electromagnetic pulses. The apparatus is inserted between two coaxial...
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3771091 |
POTTED METAL OXIDE VARISTOR
A metal oxide varistor has a high thermal conductivity potting material encapsulating completely the metal oxide varistor and a portion of the leads therefrom, a pair of metal plates spaced in a...
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3768058 |
METAL OXIDE VARISTOR WITH LATERALLY SPACED ELECTRODES
A metal oxide varistor having an alpha in excess of 10 in the current density range of from 10 -3 to 10 2 amperes per square centimeter is formed with laterally spaced electrodes adjacent a first...
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3766510 |
VOLTAGE SENSOR AND METHOD OF USING SAME
Metal sulfide compounds and metal phosphate compounds are combined in a selected manner to form a resistance material for a stable sensor having a variable resistance characteristic in response to...
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3764951 |
NON-LINEAR RESISTORS
New non-linear resistors having a remarkably stable volt-ampere characteristic are provided. Such resistors comprise several sintered wafers superposed, said sintered wafer consisting of iron oxide...
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3760318 |
PROCESS FOR MAKING A VOLTAGE DEPENDENT RESISTOR
A voltage dependent resistor comprising a sintered body of zinc oxide having: (1). voltage dependent properties by itself, (2). at least one member selected from the group consisting of L: ions and...
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3757254 |
NOISE REDUCTION SYSTEM AND APPARATUS USING A COMPRESSION AND EXPANSION SYSTEM
A noise reduction system employs a compression and expansion system using a compressor and an expandor to reduce noise in a signal transmitted through a transmission system. The compressor side of...
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3753198 |
VARISTORS
A plurality of heat radiating axial ribs are provided on the surface of a varistor. For a varistor in the form of a hollow cylinder, such ribs are formed on both or either one of the inner and...
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3745505 |
SEMICONDUCTOR DEVICE-METAL OXIDE VARISTOR-HEAT SINK ASSEMBLY
A single or plurality of metallic plates arranged in parallel relationship along the length of a body of metal oxide material in contact therewith provide a means for removal of heat developed in...
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3742419 |
INTEGRAL SENSOR FOR MONITORING A METAL OXIDE VARISTOR
A body of sintered metal oxide material having first and second opposed surfaces and a third surface disposed therebetween has first and second electrodes in contact with the first two opposed...
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3727165 |
VOLTAGE-DEPENDENT RESISTOR
Voltage-dependent resistor comprising a one-grain-thick layer provided with electrode layers which are in contact with the grains and which are arranged in a pattern of islands partly overlapping...
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3718840 |
CURRENT LIMITING ELEMENT
A current limiting element is disclosed which includes an electrical conductor consisting of one or more wires formed of a metal having a high temperature coefficient of resistance. The conductor...
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3716778 |
HIGH VOLTAGE GENERATING APPARATUS
A rod shaped varistor having a high breakdown voltage is connected across a source of high voltage so as to maintain the output voltage at a substantially constant value. The varistor is provided...
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3715701 |
NON-LINEAR RESISTANCE ELEMENT
A varistor whose ceramic body contains bismuth oxide and antimony oxide containing semiconducting titanium oxide having a relatively low C-value and a low β value.
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3691503 |
VARIABLE RESISTANCE RESISTOR ASSEMBLY
A variable resistance resistor assembly comprises as its central component a resistance element in sheet form, which can be an ohmic resistor, a thermistor having a positive or negative temperature...
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3689863 |
VOLTAGE DEPENDENT RESISTORS IN A SURFACE BARRIER TYPE
A voltage dependent resistor of the surface barrier type. A sintered body consisting essentially of, as a major part, zinc oxide (ZnO) and 0.05 to 10.0 mole percent of, as an additive, beryllium...
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3685026 |
PROCESS OF SWITCHING AN ELECTRIC CURRENT
A process of switching an electric current. A switching element is provided which has finely divided conductive particles dispersed in resin, and which has a high resistance state and a low...
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