US2722648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alternating current load control system
Assignee: Machinery Electrification Inc
•
Filing: 1953-03-02
•
Granted: 1955-11-01
•
Expires: 1973-03-02
Abstract
No abstract record available.
Inventors
- 👤 Francis P Dunigan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:25
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/08; H02H7/085
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1958-10-31 | 1959-05-02 | 1959-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-31 | 1963-05-02 | 1963-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-31 | 1967-05-02 | 1967-11-01 | $7700.00 | Window Closed / Lapsed |