US2489296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for measuring frequency deviations
Assignee: International Standard Electric Corp
•
Filing: 1943-06-22
•
Granted: 1949-11-29
•
Expires: 1963-06-22
Abstract
No abstract record available.
Inventors
- 👤 Koechlin Renaud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:07
CPC Classifications
H; H03; H03B; H03B21/00; H03B21/01; H03B21/02; G; G01; G01R; G01R23/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2187865A
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US2153274A
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US2115676A
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US2167400A
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US2190243A
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US2186182A
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US2282974A
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US2306435A
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US2321315A
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 |