US2581271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoelectric device for indicating the diminution of light
Assignee: ELEKTRO WATT ELEK SCHE und IND
•
Filing: 1947-09-09
•
Granted: 1952-01-01
•
Expires: 1967-09-09
Abstract
No abstract record available.
Inventors
- 👤 Meili Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:57
CPC Classifications
H; H01; H01J; H01J40/00; H01J40/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1800337A
Cited
US1840055A
Cited
US1996556A
Cited
GB337477A
Cited
US1980198A
Cited
US1973286A
Cited
US2098217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |