US2497404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency responsive control circuit
Assignee: Liebel Flarsheim Co LLC
•
Filing: 1947-02-05
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Granted: 1950-02-14
•
Expires: 1967-02-05
Abstract
No abstract record available.
Inventors
- 👤 Carl K Gieringer
- 👤 Arthur G Billin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:06
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/52; H03F1/54; H03F1/548; H05; H05B; H05B6/00; H05B6/02; H05B6/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2261153A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-13 | 1953-08-15 | 1954-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-13 | 1957-08-15 | 1958-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-13 | 1961-08-15 | 1962-02-14 | $7700.00 | Window Closed / Lapsed |