US2445169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical transformer and primary winding thereof
Assignee: Duracell Inc USA
•
Filing: 1944-12-05
•
Granted: 1948-07-13
•
Expires: 1964-12-05
Abstract
No abstract record available.
Inventors
- 👤 Cleon F Frey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:29
CPC Classifications
H; H01; H01F; H01F30/00; H01F30/06; H01F30/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2414692A
Cited
US1011884A
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FR532717A
Cited
US1739818A
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US1713214A
Cited
US1898931A
Cited
GB344181A
Cited
US1984979A
Cited
US1940840A
Cited
US2153090A
Cited
US2255730A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-07-13 | 1952-01-12 | 1952-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-07-13 | 1956-01-12 | 1956-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-07-13 | 1960-01-12 | 1960-07-13 | $7700.00 | Window Closed / Lapsed |