US2522139A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency responsive system
Assignee: Curtiss Wright Corp
•
Filing: 1944-10-06
•
Granted: 1950-09-12
•
Expires: 1964-10-06
Abstract
No abstract record available.
Inventors
- 👤 Joseph R Schoenbaum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:16
CPC Classifications
G; G01; G01R; G01R23/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2281995A
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US2291558A
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US2304134A
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US2324077A
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US2337328A
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US2363835A
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US2416517A
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US2442786A
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US2407140A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-11 | 1954-03-13 | 1954-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-11 | 1958-03-13 | 1958-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-11 | 1962-03-13 | 1962-09-12 | $7700.00 | Window Closed / Lapsed |