US2704841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined current responsive and temperature responsive alarm device for transformers
Assignee: McGraw Electric Co
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Filing: 1951-01-08
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Granted: 1955-03-22
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Expires: 1971-01-08
Abstract
No abstract record available.
Inventors
- 👤 Anthony Van Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:18
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/04; H02H5/00; H02H5/04; H02H5/06
Claims Analysis
Total Claims: 0
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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) | 1958-03-21 | 1958-09-20 | 1959-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-03-21 | 1962-09-20 | 1963-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-03-21 | 1966-09-20 | 1967-03-22 | $7700.00 | Window Closed / Lapsed |