US3414801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inverter symmetry correction circuit
Assignee: AT&T Inc
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Filing: 1967-04-25
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Granted: 1968-12-03
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Expires: 1987-04-25
Abstract
No abstract record available.
Inventors
- 👤 John D Bishop
- 👤 Joseph W Ianniello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:47
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/5383; H02M7/53832; H10; H10D; H10D99/00; H10W; H10W74/00; H10W74/10; H10W74/131; H02M7/4815; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-03 | 1972-06-03 | 1972-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-03 | 1976-06-03 | 1976-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-03 | 1980-06-03 | 1980-12-03 | $7700.00 | Window Closed / Lapsed |