US2629857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Communication system utilizing constant amplitude pulses of opposite polarities
Assignee: International Standard Electric Corp
•
Filing: 1947-10-08
•
Granted: 1953-02-24
•
Expires: 1967-10-08
Abstract
No abstract record available.
Inventors
- 👤 Deloraine Edmond Maurice
- 👤 Derjavitch Boris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:01
CPC Classifications
H; H03; H03M; H03M3/00; H03M3/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1796430A
Cited
US2202605A
Cited
US2272070A
Cited
US2433407A
Cited
US2321611A
Cited
US2426225A
Cited
US2426204A
Cited
US2438908A
Cited
US2464607A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-02-24 | 1956-08-25 | 1957-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-24 | 1960-08-25 | 1961-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-24 | 1964-08-25 | 1965-02-24 | $7700.00 | Window Closed / Lapsed |