Patent US3519726A successfully refreshed from Google Patents.
US3519726A
Expired / Lapsed
US
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Transformer vault for underground installation
Assignee: Youngstown Steel and Alloy Co
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Filing: 1968-11-06
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Granted: 1970-07-07
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Expires: 1988-11-06
Abstract
No abstract record available.
Inventors
- 👤 Sam M Ewing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:27
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US58648A
Cited
US1076595A
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US1265767A
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US1585265A
Cited
AT151849B
Cited
US2803370A
Cited
US3086674A
Cited
FR1335646A
Cited
GB1081209A
Cited
US3390225A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-06 | 1974-01-05 | 1974-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-06 | 1978-01-05 | 1978-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-06 | 1982-01-05 | 1982-07-07 | $7700.00 | Window Closed / Lapsed |