US3676743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-discharge overvoltage arrester
Assignee: Siemens AG
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Filing: 1970-09-24
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Granted: 1972-07-11
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Expires: 1990-09-24
Abstract
Abstract A voltage overload arrester comprising a pair of shaped electrodes having surface portions in spaced adjacent relation to each other and gas impermeably sealed within an insulating housing. The adjacent surface portions of each electrode are provided with a thin coating of an alloy of a material having a high electron emission ability, such as Ba, and a material having a stabilizing effect on the electron work function of such emission material, such as Al. The method comprises forming the alloy-coated electrodes and subjecting them to heat of about 700* to 900* C. so as to eliminate all impurities from the alloy coating.
Inventors
- 👤 Alex Bahr
- 👤 Gerhard Peche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:19
CPC Classifications
H; H01; H01T; H01T1/00; H01T1/20; H01T1/22; F; F04; F04B; F04B3/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
79 words
A gas-discharge voltage overload arrester comprising, a gas impermeable housing having an interior chamber, a pair of shaped electrode members positioned in working relationship within said interior chamber, said electrodes each having a work surface in spaced facing relation to each other, and an outer peripheral layer on at least one of said work surfaces, said layer consisting essentially of a substantially uniform intermixture of a first material having a relatively high electron emission ability and at least aluminum.
Claim 2
Dependent Claim
79 words
A gas-discharge voltage overload arrester comprising, a gas impermeable housing having an interior chamber, a pair of shaped electrode members positioned in working relationship within said interior chamber, said electrodes each having a work surface in spaced facing relation to each other, and an outer peripheral layer on at least one of said work surfaces, said layer consisting essentially of a substantially uniform intermixture of a first material having a relatively high electron emission ability and at least aluminum.
Claim 3
Dependent Claim
21 words
A gas-discharge voltAge overload arrester as defined in claim 1 wherein the first material in the layer is Ba outer peripheral.
Claim 4
Dependent Claim
39 words
A gas-discharge voltage overload arrester as defined in claim 1 wherein the outer peripheral layer is composed of about 30 percent to 90 percent by weight of Ba and about 10 percent to 70 percent by weight of Al.
Claim 5
Dependent Claim
33 words
A gas-discharge voltage overload arrester as defined in claim 1 wherein the outer peripheral layer is composed of about 50 percent by weight of Ba and about 50 percent by weight of Al.
Claim 6
Dependent Claim
104 words
A gas-discharge voltage overload arrester comprising, a housing composed of an insulating material having a pair of openings formed therein, a pair of shaped electrodes extending through the openings of said housing and positioned adjacently spaced from one another and having work surfaces in spaced facing relation to each other, a means sealing said electrodes to said housing to form a gas-impermeable housing, said electrodes protruding beyond said means to form contact points, and an outer peripheral layer on each of said surfaces, said layer consisting essentially of an alloy of a material having a relatively high electron emission ability and at least aluminum.
Claim 7
Dependent Claim
104 words
A gas-discharge voltage overload arrester comprising, a housing composed of an insulating material having a pair of openings formed therein, a pair of shaped electrodes extending through the openings of said housing and positioned adjacently spaced from one another and having work surfaces in spaced facing relation to each other, a means sealing said electrodes to said housing to form a gas-impermeable housing, said electrodes protruding beyond said means to form contact points, and an outer peripheral layer on each of said surfaces, said layer consisting essentially of an alloy of a material having a relatively high electron emission ability and at least aluminum.
Claim 8
Dependent Claim
33 words
A gas-discharge voltage overload arrester as defined in claim 5 wherein the aluminum is present in the outer peripheral layer in amounts ranging from about 10 percent to about 70 percent by weight.
Claim 9
Dependent Claim
84 words
A gas-discharge voltage overload arrester comprising a gas impermeable housing having an interior chamber, a pair of shaped electrode members positioned in working relation within said interior chamber, said electrodes each having a work surface in spaced facing relation to each other, and an outer peripheral layer on each of said work surfaces, said layer consisting essentially of a substantially uniform intermixture of about 30 percent to about 90 percent by weight Ba and about 10 percent to about 70 percent by weight Al.
Claim 10
Dependent Claim
84 words
A gas-discharge voltage overload arrester comprising a gas impermeable housing having an interior chamber, a pair of shaped electrode members positioned in working relation within said interior chamber, said electrodes each having a work surface in spaced facing relation to each other, and an outer peripheral layer on each of said work surfaces, said layer consisting essentially of a substantially uniform intermixture of about 30 percent to about 90 percent by weight Ba and about 10 percent to about 70 percent by weight Al.
Claim 11
Dependent Claim
35 words
A gas-discharge voltage overload arrester as defined in claim 7 wherein the outer peripheral layer is composed as a uniform intermixture of about 50 percent by weight Ba and about 50 percent by weight Al.
Claim 12
Independent Claim
102 words
A method of producing a gas-discharge voltage overload arrester comprising: coating a relatively thin layer of a substantially uniform inter-mixture of a first material having a relatively high electron-emission ability and at least aluminum onto a work surface of an electrode, subjecting the coated electrode to a heat treatment including temperatures in the range of about 700* to 900* C. for a period of time sufficient to eliminate any impurities within said layer, and assembling such heat treated electrodes into a gas impermeable voltage overload arrester structure so that said electrode work surfaces are spaced in facing adjacent relation from each other.
Claim 13
Independent Claim
102 words
A method of producing a gas-discharge voltage overload arrester comprising: coating a relatively thin layer of a substantially uniform inter-mixture of a first material having a relatively high electron-emission ability and at least aluminum onto a work surface of an electrode, subjecting the coated electrode to a heat treatment including temperatures in the range of about 700* to 900* C. for a period of time sufficient to eliminate any impurities within said layer, and assembling such heat treated electrodes into a gas impermeable voltage overload arrester structure so that said electrode work surfaces are spaced in facing adjacent relation from each other.
Claim 14
Dependent Claim
51 words
A method as defined in claim 9 wherein the first material is Ba and is present in amounts ranging from about 30 percent to about 90 percent by weight and the second material is Al and is present in amounts ranging from about 10 percent to about 70 percent by weight.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |