US2452051A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Relay system
Assignee: AT&T Inc
•
Filing: 1945-03-15
•
Granted: 1948-10-26
•
Expires: 1965-03-15
Abstract
No abstract record available.
Inventors
- 👤 Ralph E Hersey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:41
CPC Classifications
H; H03; H03K; H03K23/00; H03K23/74
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1226184A
Cited
US1980190A
Cited
US2067145A
Cited
US2206660A
Cited
US2241156A
Cited
US2281396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-26 | 1952-04-26 | 1952-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-26 | 1956-04-26 | 1956-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-26 | 1960-04-26 | 1960-10-26 | $7700.00 | Window Closed / Lapsed |