US3012190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple frequency alternating current network
Assignee: Electro Mechanical Research Inc
•
Filing: 1946-03-06
•
Granted: 1961-12-05
•
Expires: 1966-03-06
Abstract
No abstract record available.
Inventors
- 👤 Doll Henri-Georges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:17
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/08; G01V3/10; G01V3/104; G01V3/108
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2220070A
Cited
US2167630A
Cited
US2139460A
Cited
US2268106A
Cited
US2408029A
Cited
US2411843A
Cited
US2447316A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-12-04 | 1965-06-05 | 1965-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-04 | 1969-06-05 | 1969-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-04 | 1973-06-05 | 1973-12-05 | $7700.00 | Window Closed / Lapsed |