GB464274A - Improvements in resistances having negative temperature coefficients - Google Patents
Improvements in resistances having negative temperature coefficientsInfo
- Publication number
- GB464274A GB464274A GB20013/35A GB2001335A GB464274A GB 464274 A GB464274 A GB 464274A GB 20013/35 A GB20013/35 A GB 20013/35A GB 2001335 A GB2001335 A GB 2001335A GB 464274 A GB464274 A GB 464274A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oxides
- oxide
- reducing atmosphere
- niobium
- vanadium
- 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
Abstract
A resistance having a high negative temperature coefficient is produced by mixing one or more of the following, (a) titanium dioxide, (b) niobium pentoxide, (c) vanadium pentoxide with a good insulating oxide such as an alkaline earth oxide, e.g. magnesium oxide which is not decomposed by heat, moulding and then heating in a non-oxidizing or reducing atmosphere so that the higher oxides of titanium, niobium and vanadium are transformed into their lower conducting oxides. The mixture may be burnt in an oxygen containing atmosphere prior to heating in a reducing atmosphere such as hydrogen. In a modification niobium trioxide and/or vanadium trioxide may be mixed with one or more trivalent insulating oxides such as aluminium oxide or chromium oxide and burnt in a reducing atmosphere at 1600 DEG C. or more. The Specification as open to inspection under Sect. 91 disclosed the use, in lieu of titanium oxide, of oxides of copper, zinc, eadmium, tin lead, iron and cobalt. Alternatively in lieu of oxides sulphides selenides or tellurides were proposed. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE464274X | 1934-07-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB464274A true GB464274A (en) | 1937-04-12 |
Family
ID=6540240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB20013/35A Expired GB464274A (en) | 1934-07-13 | 1935-07-12 | Improvements in resistances having negative temperature coefficients |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB464274A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2700720A (en) * | 1948-12-15 | 1955-01-25 | Julius J Torok | Thermistor |
-
1935
- 1935-07-12 GB GB20013/35A patent/GB464274A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2700720A (en) * | 1948-12-15 | 1955-01-25 | Julius J Torok | Thermistor |
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