US2724019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic telephone systems
Assignee: International Standard Electric Corp
•
Filing: 1951-10-08
•
Granted: 1955-11-15
•
Expires: 1971-10-08
Abstract
No abstract record available.
Inventors
- 👤 Gohorel Fernand Pierre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:01
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2244700A
Cited
US2284870A
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US2298699A
Cited
US2338242A
Cited
US2484612A
Cited
US2517587A
Cited
US2633498A
Cited
US2603716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-14 | 1959-05-16 | 1959-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-14 | 1963-05-16 | 1963-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-14 | 1967-05-16 | 1967-11-15 | $7700.00 | Window Closed / Lapsed |