GB367790A - Improvements in or relating to electric negative resistances - Google Patents
Improvements in or relating to electric negative resistancesInfo
- Publication number
- GB367790A GB367790A GB2426230A GB2426230A GB367790A GB 367790 A GB367790 A GB 367790A GB 2426230 A GB2426230 A GB 2426230A GB 2426230 A GB2426230 A GB 2426230A GB 367790 A GB367790 A GB 367790A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pressure
- powder
- electrodes
- negative resistance
- resistance characteristic
- 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
- H01C7/10—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 voltage responsive, i.e. varistors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/14—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors
- H01C1/1413—Terminals or electrodes formed on resistive elements having negative temperature coefficient
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermistors And Varistors (AREA)
- Conductive Materials (AREA)
- Contacts (AREA)
Abstract
367,790. Generating and amplifying high-frequency oscillations. HABANN, E., 44, Stargarderstrasse, Berlin. Aug. 13, 1930, No. 24262. Convention date, Aug. 16, 1929. [Class 40 (v).] A material such as galena, which in contact with an iron wire has a negative resistance characteristic, is reduced to fine powder and placed between electrodes, the pressure of which is adjusted so as to produce a negative resistance characteristic by the loose contact between the individual grains. The size of the granules is determined experimentally, and is stated to be below 0À1 mm. The pressure of the electrodes necessary is stated to vary directly with the volume of the substance. As an example, with a column 1 sq. mm. in area and 1 cm. long, the pressure should be in the neighbourhood of 300 grms. per sq. em- A mixture of lead sulphide with a small proportion of copper sulphide is fused or sintered as disclosed in Specification 360,920, and then powdered. Metals, such as iron or molybdenum, which give a negative resistance characteristic in contact with the substance used may be added. About one-third of its volume of a neutral powder of the same chemical nature, such as antimony trisulphide, is then added and the mixture ground up and pressed firmly between two electrodes. The pressure in this case may be about ten times that required when the neutral powder is absent. The resistance powder may be immersed in a non- conducting liquid such as oil, benzol, &c. This liquid or the surrounding gas is preferably subjected to a pressure higher than atmospheric. The resistance may be cooled by embedding a number of metal discs in the mass so as to project at their edges as cooling ribs, which may dip into oil. Resistances made in accordance with the invention are applicable for the generation and amplification of electric oscillations, and may be employed as repeaters in telephone lines. Reference has been directed by the Comptroller to Specifications 103,046 and 292,110, [both in Class 37, Electricity, Measuring &c.].
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEH122953D DE608853C (en) | 1929-08-16 | 1929-08-16 | Negative resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB367790A true GB367790A (en) | 1932-02-15 |
Family
ID=7174244
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2426130A Expired GB360920A (en) | 1929-08-16 | 1930-08-13 | Improvements in or relating to electric negative resistances |
| GB2426230A Expired GB367790A (en) | 1929-08-16 | 1930-08-13 | Improvements in or relating to electric negative resistances |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2426130A Expired GB360920A (en) | 1929-08-16 | 1930-08-13 | Improvements in or relating to electric negative resistances |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE608853C (en) |
| GB (2) | GB360920A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2609470A (en) * | 1949-07-22 | 1952-09-02 | Gen Electric | Resistance materials and elements |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE939099C (en) * | 1946-09-06 | 1956-02-16 | Eberhard Meyer-Hartwig | Process for the production of electrical semiconductors from sintered powders |
| DE1143259B (en) * | 1953-08-13 | 1963-02-07 | Siemens Ag | Electrical semiconductor resistance independent of the outside temperature |
-
1929
- 1929-08-16 DE DEH122953D patent/DE608853C/en not_active Expired
-
1930
- 1930-08-13 GB GB2426130A patent/GB360920A/en not_active Expired
- 1930-08-13 GB GB2426230A patent/GB367790A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2609470A (en) * | 1949-07-22 | 1952-09-02 | Gen Electric | Resistance materials and elements |
Also Published As
| Publication number | Publication date |
|---|---|
| GB360920A (en) | 1931-11-13 |
| DE608853C (en) | 1936-01-28 |
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