GB1262420A - Improvements in or relating to voltage overload protectors - Google Patents
Improvements in or relating to voltage overload protectorsInfo
- Publication number
- GB1262420A GB1262420A GB33871/70A GB3387170A GB1262420A GB 1262420 A GB1262420 A GB 1262420A GB 33871/70 A GB33871/70 A GB 33871/70A GB 3387170 A GB3387170 A GB 3387170A GB 1262420 A GB1262420 A GB 1262420A
- Authority
- GB
- United Kingdom
- Prior art keywords
- nickel
- electrodes
- powdered mixture
- voltage overload
- relating
- 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
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T1/00—Details of spark gaps
- H01T1/20—Means for starting arc or facilitating ignition of spark gap
- H01T1/22—Means for starting arc or facilitating ignition of spark gap by the shape or the composition of the electrodes
Abstract
1,262,420. Cold-cathode tubes. SIEMENS A.G. 13 July, 1970 [14 July, 1969], No. 33871/70. Heading H1D. A voltage overload protector comprises a gastight housing (not shown) and two electrodes 2 and 3 facing one another within the housing, at least one of the electrodes having a coating 4 comprising a substance having a high thermal electron emissivity and nickel, the coating being formed by applying a powdered mixture of the components to the surface and sintering the powdered mixture. Preferably the emissive substance is thorium oxide amounting to 10- 50% by weight, and the other constituents may be 0-20% magnesium oxide and 30-90% nickel. The thorium oxide should have a grain size of 1-50 Á, the magnesium oxide 0À2-10 Á, and the nickel 1-50 Á, preferred sizes being 30 Á, 2 Á, and 10 Á respectively. The electrodes may be of a nickel-iron or a nickel-iron-cobalt alloy, and the powdered mixture may be sintered on at 900 C.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19691935734 DE1935734A1 (en) | 1969-07-14 | 1969-07-14 | Surge arresters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1262420A true GB1262420A (en) | 1972-02-02 |
Family
ID=5739778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB33871/70A Expired GB1262420A (en) | 1969-07-14 | 1970-07-13 | Improvements in or relating to voltage overload protectors |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3691428A (en) |
| CH (1) | CH508291A (en) |
| DE (1) | DE1935734A1 (en) |
| FR (1) | FR2054207A5 (en) |
| GB (1) | GB1262420A (en) |
| SE (1) | SE355702B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE360507B (en) * | 1972-11-08 | 1973-09-24 | Ericsson Telefon Ab L M | |
| GB1411493A (en) * | 1973-03-23 | 1975-10-29 | M O Valve Co Ltd | Excess voltage arresters |
| GB1411492A (en) * | 1973-03-23 | 1975-10-29 | M O Valve Co Ltd | Excess voltage arresters |
| US3858077A (en) * | 1973-11-20 | 1974-12-31 | Gen Instrument Corp | Gas tube transient voltage protector for telecommunication systems |
| US3904910A (en) * | 1973-11-23 | 1975-09-09 | Ericsson Telefon Ab L M | Gas-filled discharge overvoltage protector |
| DE2431236C3 (en) * | 1974-06-28 | 1978-10-19 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Surge arresters |
| DE2828650C3 (en) * | 1978-06-29 | 1982-03-25 | Siemens AG, 1000 Berlin und 8000 München | Surge arresters |
| DE2914836C2 (en) * | 1979-04-11 | 1983-11-17 | Siemens AG, 1000 Berlin und 8000 München | Manufacturing process for the electrode activation compound in a gas discharge tube |
| EP0242590B1 (en) * | 1986-04-22 | 1989-06-07 | Siemens Aktiengesellschaft | Gas-discharge surge arrester |
| JP2009508320A (en) | 2005-09-14 | 2009-02-26 | リッテルフューズ，インコーポレイティド | Surge arrester with gas, activation compound, ignition stripe and method thereof |
-
1969
- 1969-07-14 DE DE19691935734 patent/DE1935734A1/en active Pending
-
1970
- 1970-07-06 FR FR7024962A patent/FR2054207A5/fr not_active Expired
- 1970-07-09 CH CH1037470A patent/CH508291A/en not_active IP Right Cessation
- 1970-07-09 SE SE09573/70A patent/SE355702B/xx unknown
- 1970-07-13 GB GB33871/70A patent/GB1262420A/en not_active Expired
- 1970-07-13 US US54312A patent/US3691428A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| SE355702B (en) | 1973-04-30 |
| US3691428A (en) | 1972-09-12 |
| CH508291A (en) | 1971-05-31 |
| DE1935734A1 (en) | 1971-01-28 |
| FR2054207A5 (en) | 1971-04-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |