US2489374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for producing a saw-tooth current in inductance coils
Assignee: Hartford National Bank and Trust Co
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Filing: 1947-05-03
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Granted: 1949-11-29
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Expires: 1967-05-03
Abstract
No abstract record available.
Inventors
- 👤 Haantijes Johan
- 👤 Valeton Josue Jean Philippe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:13
CPC Classifications
H; H03; H03K; H03K6/00; H03K6/04; H03K4/00; H03K4/06; H03K4/08; H03K4/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB552688A
Cited
US2382822A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |