US2592784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Restricted service telephone system
Assignee: Automatic Electric Laboratories Inc
•
Filing: 1947-01-22
•
Granted: 1952-04-15
•
Expires: 1967-01-22
Abstract
No abstract record available.
Inventors
- 👤 Bakker Pier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:22
CPC Classifications
H; H04; H04Q; H04Q3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2375514A
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US2333474A
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US2311214A
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US2419282A
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US2416131A
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US2530845A
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US2490221A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-15 | 1955-10-15 | 1956-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-15 | 1959-10-15 | 1960-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-15 | 1963-10-15 | 1964-04-15 | $7700.00 | Window Closed / Lapsed |