US2730579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Order wire and alarm circuits for carrier systems
Assignee: AT&T Inc
•
Filing: 1950-11-25
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Granted: 1956-01-10
•
Expires: 1970-11-25
Abstract
No abstract record available.
Inventors
- 👤 Robert L Case
- 👤 Homer G Jordan
- 👤 Myron R Kleist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:12
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2268872A
Cited
US2434946A
Cited
US2391941A
Cited
US2401023A
Cited
US2504603A
Cited
US2547011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-09 | 1959-07-11 | 1960-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-09 | 1963-07-11 | 1964-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-09 | 1967-07-11 | 1968-01-10 | $7700.00 | Window Closed / Lapsed |