Patent US3510726A successfully refreshed from Google Patents.
US3510726A
Expired / Lapsed
US
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Grading and cascading circuit for lightning arresters having a plurality of spark gaps
Assignee: Westinghouse Electric Corp
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Filing: 1967-10-31
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Granted: 1970-05-05
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Expires: 1987-10-31
Abstract
No abstract record available.
Inventors
- 👤 John E Harder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:23
CPC Classifications
H; H01; H01T; H01T4/00; H01T4/16; H01T4/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR1310009A
Cited
GB578664A
Cited
US2618765A
Cited
US2948831A
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GB940978A
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GB1038050A
Cited
US3376458A
Cited
US3353059A
Cited
US3418530A
Cited
US3356894A
Cited
US3414759A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-04 | 1973-11-03 | 1974-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-04 | 1977-11-03 | 1978-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-04 | 1981-11-03 | 1982-05-05 | $7700.00 | Window Closed / Lapsed |