US2639331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic telephone system
Assignee: Automatic Electric Laboratories Inc
•
Filing: 1947-03-11
•
Granted: 1953-05-19
•
Expires: 1967-03-11
Abstract
No abstract record available.
Inventors
- 👤 John E Ostline
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:02
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/0004
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1463815A
Cited
US1515735A
Cited
US1563658A
Cited
US1472503A
Cited
US1551033A
Cited
US1565637A
Cited
US2027463A
Cited
US2350458A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |