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Patent US2449961A successfully refreshed from Google Patents.
US2449961A
Expired / Lapsed
US
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Electrical protective device
Assignee: Siemens Electric Lamps and Supplies Ltd
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Filing: 1944-04-17
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Granted: 1948-09-21
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Expires: 1964-04-17
Abstract
No abstract record available.
Inventors
- 👤 Treece Harold Robert
- 👤 Wilkinson Ralph Alan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:28
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/02; H01J17/30; H01J17/32; H01T; H01T1/00; H01T1/20; H01T1/22
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) | 1951-09-21 | 1952-03-22 | 1952-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-21 | 1956-03-22 | 1956-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-21 | 1960-03-22 | 1960-09-21 | $7700.00 | Window Closed / Lapsed |