Patent US3876894A successfully refreshed from Google Patents.
US3876894A
Expired / Lapsed
US
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Button overvoltage arrester with cup-shaped electrodes with different side and end wall thicknesses
Assignee: Siemens AG
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Filing: 1970-09-29
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Granted: 1975-04-08
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Expires: 1990-09-29
Abstract
Abstract A button overvoltage arrester is provided with frustroconical cup-shaped electrodes each of which have an active area electrode wall thickness of at least twice the thickness of the conical side wall to prevent burning of the electrodes and to promote heat dissipation via the respective lead conductors which are connected to the electrode active areas. The cup-shaped electrodes are formed by drawing cups from a flat metal plate, preferably a Ni-Fe-Co alloy.
Inventors
- 👤 Gerhard Peche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:59
CPC Classifications
H; H01; H01J; H01J21/00; H01T; H01T1/00; H01T1/20; H01T1/22
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
128 words
A symmetrical overvoltage arrester comprising a gas-tight housing including a tubular insulating member, a pair of identical one-piece cup-shaped electrodes sealed to respective ends of said tubular insulating member, each of said electrodes including a side wall and an end wall integral therewith, each of said end walls disposed spaced from and including a surface facing the like surface of the other within said tubular insulating member, and a pair of electrical leads connected to respective other surfaces of respective end walls and extending outside of said tubular insulating member, said end walls each having a thickness of at least a multiple greater than the thickness of the respective side walls to hinder heat transfer to said tubular insulating member so that heat is dissipated through said leads.
Claim 2
Dependent Claim
128 words
A symmetrical overvoltage arrester comprising a gas-tight housing including a tubular insulating member, a pair of identical one-piece cup-shaped electrodes sealed to respective ends of said tubular insulating member, each of said electrodes including a side wall and an end wall integral therewith, each of said end walls disposed spaced from and including a surface facing the like surface of the other within said tubular insulating member, and a pair of electrical leads connected to respective other surfaces of respective end walls and extending outside of said tubular insulating member, said end walls each having a thickness of at least a multiple greater than the thickness of the respective side walls to hinder heat transfer to said tubular insulating member so that heat is dissipated through said leads.
Claim 3
Dependent Claim
28 words
An overvoltage arrester according to claim 1, wherein the thickness of each of said end walls is at least three times the thickness of the respective side walls.
Claim 4
Dependent Claim
36 words
An overvoltage arrester according to claim 2, wherein the thickness of each said side wall is about 0.3 mm and the thickness of each said end wall is in the range between 1 and 2 mm.
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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |