US2576249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Level ratio measuring system
Assignee: AT&T Inc
•
Filing: 1947-08-28
•
Granted: 1951-11-27
•
Expires: 1967-08-28
Abstract
No abstract record available.
Inventors
- 👤 Harold L Barney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:39
CPC Classifications
G; G01; G01R; G01R23/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2251064A
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US2313666A
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US2305543A
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US2352082A
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US2349881A
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US2457013A
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US2413977A
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US2429788A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-26 | 1955-05-28 | 1955-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-26 | 1959-05-28 | 1959-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-26 | 1963-05-28 | 1963-11-27 | $7700.00 | Window Closed / Lapsed |