US2679551A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitative commutator
Assignee: AT&T Inc
•
Filing: 1950-09-21
•
Granted: 1954-05-25
•
Expires: 1970-09-21
Abstract
No abstract record available.
Inventors
- 👤 Neal D Newby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:44
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2238089A
Cited
US2257894A
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US2281495A
Cited
US2329544A
Cited
US2437064A
Cited
US2587780A
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 |