US2499720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for testing insulation
Assignee: AT&T Inc
•
Filing: 1945-11-30
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Granted: 1950-03-07
•
Expires: 1965-11-30
Abstract
No abstract record available.
Inventors
- 👤 Wentworth D Boynton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:20
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/50; G01R31/58
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1977703A
Cited
US1886682A
Cited
US1950484A
Cited
US2108637A
Cited
US2310335A
Cited
US2376232A
Cited
US2440480A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-06 | 1953-09-05 | 1954-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-06 | 1957-09-05 | 1958-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-06 | 1961-09-05 | 1962-03-07 | $7700.00 | Window Closed / Lapsed |