US2500875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tunable high-frequency tank circuit
Assignee: Patelhold Patenverwertungs and Elektro-Holding AG
•
Filing: 1944-02-28
•
Granted: 1950-03-14
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Expires: 1964-02-28
Abstract
No abstract record available.
Inventors
- 👤 Schupbach Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:31
CPC Classifications
H; H01; H01P; H01P7/00; H01P7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1625330A
Cited
DE622515C
Cited
US1592834A
Cited
US1718783A
Cited
FR716714A
Cited
GB511795A
Cited
US2251085A
Cited
US2328561A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |