Patent US2472140A successfully refreshed from Google Patents.
US2472140A
Expired / Lapsed
US
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Lighting transformer
Assignee: LOUIS R DUMAN
•
Filing: 1945-08-31
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Granted: 1949-06-07
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Expires: 1965-08-31
Abstract
No abstract record available.
Inventors
- 👤 Berger Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:46
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/16; H05B41/18; Y; Y10; Y10S; Y10S315/00; Y10S315/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE22712E
Cited
US2025471A
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US2177883A
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US2298935A
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US2241261A
Cited
US2332455A
Cited
US2314311A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-06 | 1952-12-06 | 1953-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-06 | 1956-12-06 | 1957-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-06 | 1960-12-06 | 1961-06-07 | $7700.00 | Window Closed / Lapsed |