US2531301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for frequency controls
Assignee: Hartford National Bank and Trust Co
•
Filing: 1946-06-07
•
Granted: 1950-11-21
•
Expires: 1966-06-07
Abstract
No abstract record available.
Inventors
- 👤 Scholten Egbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:20
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/10; H03C3/24; H03B; H03B5/00; H03B5/08; H03B5/10; H03J; H03J7/00; H03J7/02; H03J7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1683012A
Cited
GB166594A
Cited
US1997084A
Cited
US2397701A
Cited
US2265016A
Cited
US2349885A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |