US1769918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrooptical transmission system
Assignee: AT&T Inc
•
Filing: 1929-02-02
•
Granted: 1930-07-08
•
Expires: 1949-02-02
Abstract
No abstract record available.
Inventors
- 👤 Gray Frank
- 👤 John R Hefele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:58
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/08; H04N7/0803; H04J; H04J1/00; H04N11/00; H04N11/06; H04N11/12; H04N7/12; H04N7/127
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1933-07-07 | 1934-01-06 | 1934-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-07-07 | 1938-01-06 | 1938-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-07-07 | 1942-01-06 | 1942-07-08 | $7700.00 | Window Closed / Lapsed |