Patent US2994820A successfully refreshed from Google Patents.
US2994820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulation fault locator
Assignee: AT&T Inc
•
Filing: 1958-06-04
•
Granted: 1961-08-01
•
Expires: 1978-06-04
Abstract
No abstract record available.
Inventors
- 👤 Raymond W Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:36
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/50; G01R31/58; G01R31/59
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2270732A
Cited
US2324835A
Cited
US2440283A
Cited
US2532336A
Cited
US2594595A
Cited
US2522151A
Cited
GB681779A
Cited
US2701336A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-31 | 1965-01-30 | 1965-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-31 | 1969-01-30 | 1969-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-31 | 1973-01-30 | 1973-08-01 | $7700.00 | Window Closed / Lapsed |