US2628340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage and current regulation
Assignee: AT&T Inc
•
Filing: 1947-07-29
•
Granted: 1953-02-10
•
Expires: 1967-07-29
Abstract
No abstract record available.
Inventors
- 👤 James A Potter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:06
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/90; H02J7/94; H02J7/02; H02J7/04; H02J7/12; H02J7/96
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-02-10 | 1956-08-11 | 1957-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-10 | 1960-08-11 | 1961-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-10 | 1964-08-11 | 1965-02-10 | $7700.00 | Window Closed / Lapsed |