GB541222A - Electrically conductive devices and methods of making the same - Google Patents
Electrically conductive devices and methods of making the sameInfo
- Publication number
- GB541222A GB541222A GB11630/40A GB1163040A GB541222A GB 541222 A GB541222 A GB 541222A GB 11630/40 A GB11630/40 A GB 11630/40A GB 1163040 A GB1163040 A GB 1163040A GB 541222 A GB541222 A GB 541222A
- Authority
- GB
- United Kingdom
- Prior art keywords
- particles
- expansion
- conducting
- electrodes
- coefficient
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/04—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having negative temperature coefficient
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/24—Conductive material dispersed in non-conductive organic material the conductive material comprising carbon-silicon compounds, carbon or silicon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/008—Thermistors
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Electromagnetism (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
- Thermistors And Varistors (AREA)
Abstract
541,222. Resistances. STANDARD TELEPHONES & CABLES, Ltd. July 12, 1940, No. 11630. Convention date, July 13, 1939. [Class 37] A resistance having a large temperature variation comprises a plurality of conducting particles, a non-conducting body, and a plurality of electrodes, the body maintaining the electrodes in spaced relation and supporting the particles between them, whereby contiguous particles are in mutually contacting relation and the particles adjacent to the electrodes are in contact therewith, the body and particles having widely different values of co-efficient of thermal expansion. Conducting granules 10 are enclosed in a tube 11, into the ends of which conductors 12 are sealed. If the device is to have a negative resistance-temperature coefficient the granules 10 may be of carbon, having a high coefficient of expansion, and the tube 11 of quartz, having a low coefficient of expansion. To obtain a positive resistance-temperature coefficient, low expansion conductive particles such as carbon coated quartz spheres and a high expansion tube, for example of soft glass, may be used. In an alternative construction, the granules are maintained in microphonic contact by a matrix of plastic material, such as aluminium or other metal stearate, phenol resin, methyl methacrylate, cellulose acetate or nitrate, or a polystyrene. The conducting particles may be iron or nickel steel filings and may be mixed with powdered metal stearate and moulded into a block or disc. In another construction conducting particles are secured to the face of a block of insulating material. To obtain a positive resistancetemperature coefficient a layer of carbon-coated quartz spheres may be attached to the surface of a support of organic plastic material by spreading them over the surface and embedding by the application of heat and pressure. Metal electrodes may be applied by means of a Schoop spray. Alternatively the coated spheres may be mixed with some of the plastic material dissolved in a solvent and the mixture applied to the support.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US541222XA | 1939-07-13 | 1939-07-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB541222A true GB541222A (en) | 1941-11-18 |
Family
ID=21988928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB11630/40A Expired GB541222A (en) | 1939-07-13 | 1940-07-12 | Electrically conductive devices and methods of making the same |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB541222A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5864280A (en) * | 1995-09-29 | 1999-01-26 | Littlefuse, Inc. | Electrical circuits with improved overcurrent protection |
| US6023403A (en) | 1996-05-03 | 2000-02-08 | Littlefuse, Inc. | Surface mountable electrical device comprising a PTC and fusible element |
| US6282072B1 (en) | 1998-02-24 | 2001-08-28 | Littelfuse, Inc. | Electrical devices having a polymer PTC array |
| US6582647B1 (en) | 1998-10-01 | 2003-06-24 | Littelfuse, Inc. | Method for heat treating PTC devices |
| US6628498B2 (en) | 2000-08-28 | 2003-09-30 | Steven J. Whitney | Integrated electrostatic discharge and overcurrent device |
| DE102009029589A1 (en) * | 2009-09-18 | 2011-04-21 | Behr Gmbh & Co. Kg | Electrical series resistor for use in resistor unit for speed control of air in blower or air conditioning system of motor vehicle, has contact elements electrical connected with metallic coating in force-fit and/or material fit manner |
-
1940
- 1940-07-12 GB GB11630/40A patent/GB541222A/en not_active Expired
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5864280A (en) * | 1995-09-29 | 1999-01-26 | Littlefuse, Inc. | Electrical circuits with improved overcurrent protection |
| US5880668A (en) * | 1995-09-29 | 1999-03-09 | Littelfuse, Inc. | Electrical devices having improved PTC polymeric compositions |
| US6059997A (en) * | 1995-09-29 | 2000-05-09 | Littlelfuse, Inc. | Polymeric PTC compositions |
| US6023403A (en) | 1996-05-03 | 2000-02-08 | Littlefuse, Inc. | Surface mountable electrical device comprising a PTC and fusible element |
| US6282072B1 (en) | 1998-02-24 | 2001-08-28 | Littelfuse, Inc. | Electrical devices having a polymer PTC array |
| US6582647B1 (en) | 1998-10-01 | 2003-06-24 | Littelfuse, Inc. | Method for heat treating PTC devices |
| US6628498B2 (en) | 2000-08-28 | 2003-09-30 | Steven J. Whitney | Integrated electrostatic discharge and overcurrent device |
| DE102009029589A1 (en) * | 2009-09-18 | 2011-04-21 | Behr Gmbh & Co. Kg | Electrical series resistor for use in resistor unit for speed control of air in blower or air conditioning system of motor vehicle, has contact elements electrical connected with metallic coating in force-fit and/or material fit manner |
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