US2542367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective device for transformers
Assignee: Individual
•
Filing: 1945-11-13
•
Granted: 1951-02-20
•
Expires: 1965-11-13
Abstract
No abstract record available.
Inventors
- 👤 Richard H Seaman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:51
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1874407A
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DE582213C
Cited
US1962062A
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US2027189A
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GB472312A
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US2456986A
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US2463812A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-19 | 1954-08-21 | 1955-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-19 | 1958-08-21 | 1959-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-19 | 1962-08-21 | 1963-02-20 | $7700.00 | Window Closed / Lapsed |