US2679630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage indicating and recording device
Assignee: AT&T Inc
•
Filing: 1942-02-12
•
Granted: 1954-05-25
•
Expires: 1962-02-12
Abstract
No abstract record available.
Inventors
- 👤 Jr Edwin P Felch
- 👤 Slonczewski Thaddeus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:59
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2134901A
Cited
US2121054A
Cited
US2163632A
Cited
US2203689A
Cited
US2131759A
Cited
US2147674A
Cited
US2191997A
Cited
US2209369A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-24 | 1957-11-23 | 1958-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-24 | 1961-11-23 | 1962-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-24 | 1965-11-23 | 1966-05-25 | $7700.00 | Window Closed / Lapsed |