Patent US2522151A successfully refreshed from Google Patents.
US2522151A
Expired / Lapsed
US
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Circuit for testing the dielectric strength of insulating material and recording puncture points
Assignee: AT&T Inc
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Filing: 1948-03-13
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Granted: 1950-09-12
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Expires: 1968-03-13
Abstract
No abstract record available.
Inventors
- 👤 Jr John R Weeks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:20
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/50; G01R31/58
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2220489A
Cited
US2436615A
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 |