Patent US3474320A successfully refreshed from Google Patents.
US3474320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable frequency and voltage electric power inverter utilizing an auxiliary source of fixed-magnitude commutating voltage
Assignee: General Electric Co
•
Filing: 1967-11-02
•
Granted: 1969-10-21
•
Expires: 1987-11-02
Abstract
No abstract record available.
Inventors
- 👤 Edgar F Chandler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:31
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/40; H02M5/42; H02M5/44; H02M5/443; H02M5/45; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/5152; H02M7/5155
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3207974A
Cited
US3164767A
Cited
US3328667A
Cited
US3355654A
Cited
US3354370A
Cited
US3384804A
Cited
US3414800A
Cited
US3392318A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |