Patent FR432869A successfully refreshed from Google Patents.
Patent US2481667A successfully refreshed from Google Patents.
US2481667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrooptical system
Assignee: AT&T Inc
•
Filing: 1947-05-22
•
Granted: 1949-09-13
•
Expires: 1967-05-22
Abstract
No abstract record available.
Inventors
- 👤 William H T Holden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:07
CPC Classifications
H; H01; H01J; H01J40/00; H01J40/02; H01J40/14
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2032958A
Cited
US2036286A
Cited
US2084186A
Cited
US2213024A
Cited
US2160037A
Cited
US2274158A
Cited
US2411078A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-09-12 | 1953-03-14 | 1953-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-09-12 | 1957-03-14 | 1957-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-09-12 | 1961-03-14 | 1961-09-13 | $7700.00 | Window Closed / Lapsed |