US2691064A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Measuring circuits
Assignee: AT&T Inc
•
Filing: 1950-02-21
•
Granted: 1954-10-05
•
Expires: 1970-02-21
Abstract
No abstract record available.
Inventors
- 👤 Shepherd Judson O'd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:26
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/08; H04M3/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2079721A
Cited
US2073756A
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US2112375A
Cited
US2094060A
Cited
US2373908A
Cited
US2522000A
Cited
US2400085A
Cited
US2488797A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-04 | 1958-04-05 | 1958-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-04 | 1962-04-05 | 1962-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-04 | 1966-04-05 | 1966-10-05 | $7700.00 | Window Closed / Lapsed |