US2598221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power amplifier circuit
Assignee: AT&T Inc
•
Filing: 1947-11-08
•
Granted: 1952-05-27
•
Expires: 1967-11-08
Abstract
No abstract record available.
Inventors
- 👤 Everett T Burton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:16
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/121; G05D3/122; G01; G01S; G01S3/00; G01S3/02; G01S3/14; G01S3/38; G01S3/42; G05D3/124
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2352103A
Cited
US1669958A
Cited
US1892924A
Cited
US1752839A
Cited
US1940723A
Cited
US2226746A
Cited
US2070772A
Cited
US2273150A
Cited
US2393936A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-27 | 1955-11-26 | 1956-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-27 | 1959-11-26 | 1960-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-27 | 1963-11-26 | 1964-05-27 | $7700.00 | Window Closed / Lapsed |