US1613686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for secret electrical transmission of pictures
Assignee: AT&T Inc
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Filing: 1924-12-05
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Granted: 1927-01-11
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Expires: 1944-12-05
Abstract
No abstract record available.
Inventors
- 👤 Gilbert S Vernam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:50
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/90; H04N19/93
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) | 1930-01-10 | 1930-07-12 | 1931-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-01-10 | 1934-07-12 | 1935-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-01-10 | 1938-07-12 | 1939-01-11 | $7700.00 | Window Closed / Lapsed |