US2540478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multivibrator
Assignee: AT&T Inc
•
Filing: 1945-06-04
•
Granted: 1951-02-06
•
Expires: 1965-06-04
Abstract
No abstract record available.
Inventors
- 👤 George R Frost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:07
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/10; H03K4/12; H03K4/14; H03K3/00; H03K3/02; H03K3/04; H03K3/05; H03K3/06; H03K3/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1587520A
Cited
US1813469A
Cited
US2154492A
Cited
US2211750A
Cited
US2157434A
Cited
US2213820A
Cited
US2356071A
Cited
US2365512A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |