US2418609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone system
Assignee: Automatic Electric Laboratories Inc
•
Filing: 1944-10-23
•
Granted: 1947-04-08
•
Expires: 1964-10-23
Abstract
No abstract record available.
Inventors
- 👤 John H Voss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:18
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2303918A
Cited
US1209253A
Cited
US1854106A
Cited
US2154776A
Cited
US2236499A
Cited
US2301822A
Cited
US2315010A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-04-07 | 1950-10-07 | 1951-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-04-07 | 1954-10-07 | 1955-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-04-07 | 1958-10-07 | 1959-04-08 | $7700.00 | Window Closed / Lapsed |