Patent US4204238A successfully refreshed from Google Patents.
US4204238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surge voltage lightning arresters
Assignee: Hubbell Inc
•
Filing: 1978-02-06
•
Granted: 1980-05-20
•
Expires: 1998-02-06
Abstract
Abstract A surge voltage lightning arrester ground lead disconnector utilizes a refractory metal coating on the explosive cartridge to provide a thermal delay to the arcing that occurs during disconnector operation. The thermal delay insures the explosion of the cartridge and promotes venting the arrester housing.
Inventors
- 👤 Earl W. Stetson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:11
CPC Classifications
H; H01; H01T; H01T1/00; H01T1/15
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
80 words
An improved ground disconnector for a surge arrester of the type having a metal sealing disc and an explosive cartridge, the improvement which comprises: an embossed aluminum sealing disc having a raised portion for electrically connecting with the surge arrester and a flat portion in arc relationship with the explosive cartridge; and a refractory metal coating having a thickness of from 0.005" to 0.030" deposited on a portion of the explosive cartridge to provide a thermal delay to the explosive.
Claim 2
Dependent Claim
80 words
An improved ground disconnector for a surge arrester of the type having a metal sealing disc and an explosive cartridge, the improvement which comprises: an embossed aluminum sealing disc having a raised portion for electrically connecting with the surge arrester and a flat portion in arc relationship with the explosive cartridge; and a refractory metal coating having a thickness of from 0.005" to 0.030" deposited on a portion of the explosive cartridge to provide a thermal delay to the explosive.
Claim 3
Dependent Claim
18 words
The disconnector of claim 1 wherein the sealing disc comprises 0.010 to 0.060 of an inch in thickness.
Claim 4
Dependent Claim
22 words
The improved ground disconnector of claim 1 wherein the refractory metal coating is selected from the group consisting of tungsten or molybdenum.
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) | 1983-05-20 | 1983-11-19 | 1984-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-20 | 1987-11-19 | 1988-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-20 | 1991-11-19 | 1992-05-20 | $7700.00 | Window Closed / Lapsed |