US2657358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable frequency response
Assignee: —
•
Filing: —
•
Granted: 1953-10-27
•
Expires: 1970-10-27
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:31
CPC Classifications
G; G01; G01R; G01R11/00; G01R11/02; G01R11/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1616754A
Cited
US1728555A
Cited
US2425407A
Cited
US2519689A
Cited
US2024966A
Cited
US2137188A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-26 | 1957-04-27 | 1957-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-26 | 1961-04-27 | 1961-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-26 | 1965-04-27 | 1965-10-27 | $7700.00 | Window Closed / Lapsed |