US2441047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transformer spark plug
Assignee: Duracell Inc USA
•
Filing: 1945-02-07
•
Granted: 1948-05-04
•
Expires: 1965-02-07
Abstract
No abstract record available.
Inventors
- 👤 Alexander C Wall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:56
CPC Classifications
H; H01; H01F; H01F30/00; H01F30/06; H01F30/08; Y; Y10; Y10S; Y10S336/00; Y10S336/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1624951A
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US1809895A
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US1853764A
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GB503041A
Cited
US2251373A
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US2276855A
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US2378893A
Cited
US2375309A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-05-04 | 1951-11-03 | 1952-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-05-04 | 1955-11-03 | 1956-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-05-04 | 1959-11-03 | 1960-05-04 | $7700.00 | Window Closed / Lapsed |