Patent US2917583A successfully refreshed from Google Patents.
US2917583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time separation communication system
Assignee: AT&T Inc
•
Filing: 1953-06-26
•
Granted: 1959-12-15
•
Expires: 1973-06-26
Abstract
No abstract record available.
Inventors
- 👤 Everett T Burton
- 👤 Albert L Robinson
- 👤 Elmer L Younker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:07
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2492344A
Cited
US2649505A
Cited
US2619548A
Cited
US2577141A
Cited
US2716159A
Cited
US2773934A
Cited
US2754367A
Cited
US2857463A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-14 | 1963-06-15 | 1963-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-14 | 1967-06-15 | 1967-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-14 | 1971-06-15 | 1971-12-15 | $7700.00 | Window Closed / Lapsed |