Patent US3560794A successfully refreshed from Google Patents.
US3560794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lightning arrester with a rupturable diaphragm for gas pressure release
Assignee: BBC Brown Boveri AG Germany
•
Filing: 1969-06-11
•
Granted: 1971-02-02
•
Expires: 1989-06-11
Abstract
Abstract A voltage surge arrester comprises one or more columns of stacked spark gaps and resistors located within a closed casing and which are connected electrically in series. In order to prevent the casing from fracturing as a result of the high thermal and mechanical stresses which are created by arcing within the casing, the spark gaps and resistors are given an annular configuration thereby to establish a continuous and approximately central channel through them and a pressure relief device is situated in the immediate vicinity of each end of the channel.
Inventors
- 👤 Hanspeter Christener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:20
CPC Classifications
H; H01; H01T; H01T1/00; H01T1/15
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
87 words
Voltage surge arrester the active part of which consists of at least one column of stacked spark gaps and resistors said arrester being located in a closed casing which is provided at least at one point with pressure release device, said resistors being ring shaped, characterized in that the spark gaps and the resistors are assembled in such a manner that the stack has a continuous approximately central channel and that a pressure release device is provided in the immediate vicinity of each end of said channel.
Claim 2
Dependent Claim
87 words
Voltage surge arrester the active part of which consists of at least one column of stacked spark gaps and resistors said arrester being located in a closed casing which is provided at least at one point with pressure release device, said resistors being ring shaped, characterized in that the spark gaps and the resistors are assembled in such a manner that the stack has a continuous approximately central channel and that a pressure release device is provided in the immediate vicinity of each end of said channel.
Claim 3
Dependent Claim
32 words
Arrester as in claim 1, characterized in that the thickness of the resistors is smallest in the region of the central channel and increases on all sides in the radially outward direction.
Claim 4
Dependent Claim
42 words
Arrester as in claims 1 and 2, characterized in that the end surfaces of the resistors are in mutual contact by way of intermediate metallic rings, said rings serving to maintain electrical contact and to form a tight joint between said resistors.
Claim 5
Dependent Claim
20 words
Arrester as in claim 1, characterized in that the pressure release device is in the form of a safety valve.
Claim 6
Dependent Claim
20 words
Arrester as in claim 1, characterized in that the pressure release device is in the form of a fracture diaphragm.
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |