US2474473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ballast lamp
Assignee: AT&T Inc
•
Filing: 1947-01-29
•
Granted: 1949-06-28
•
Expires: 1967-01-29
Abstract
No abstract record available.
Inventors
- 👤 William C Ellis
- 👤 Jr Louis H La Forge
- 👤 Addison H White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:14
CPC Classifications
H; H01; H01C; H01C3/00; H01C3/04; C; C22; C22C; C22C19/00; C22C19/07
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1385740A
Cited
US2413021A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-27 | 1952-12-27 | 1953-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-27 | 1956-12-27 | 1957-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-27 | 1960-12-27 | 1961-06-28 | $7700.00 | Window Closed / Lapsed |