US2637831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical control system
Assignee: MACBETH ARC LAMP CO
•
Filing: 1949-09-09
•
Granted: 1953-05-05
•
Expires: 1969-09-09
Abstract
No abstract record available.
Inventors
- 👤 Jr Iredell Eachus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:22
CPC Classifications
H; H05; H05B; H05B31/00; H05B31/02; H05B31/18; H05B31/22; H05B31/0081
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1885155A
Cited
US2293079A
Cited
US2259958A
Cited
US2518222A
Cited
US2460638A
Cited
US2534058A
Cited
US2454107A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-04 | 1956-11-03 | 1957-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-04 | 1960-11-03 | 1961-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-04 | 1964-11-03 | 1965-05-05 | $7700.00 | Window Closed / Lapsed |