US2422288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for testing electrical insulation
Assignee: AT&T Inc
•
Filing: 1944-06-02
•
Granted: 1947-06-17
•
Expires: 1964-06-02
Abstract
No abstract record available.
Inventors
- 👤 Wentworth D Boynton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:43
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/50; G01R31/58; G01R31/59
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1525282A
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US1787277A
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US1919802A
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GB416308A
Cited
US2220489A
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US2145724A
Cited
US2221323A
Cited
US2276032A
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US2280119A
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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) | 1950-06-16 | 1950-12-16 | 1951-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-16 | 1954-12-16 | 1955-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-16 | 1958-12-16 | 1959-06-17 | $7700.00 | Window Closed / Lapsed |