US2686290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable reluctance transformer
Assignee: SERVO CORP
•
Filing: 1950-01-12
•
Granted: 1954-08-10
•
Expires: 1970-01-12
Abstract
No abstract record available.
Inventors
- 👤 Macklem F Sutherland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:24
CPC Classifications
H; H03; H03F; H03F9/00; H03F9/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1306525A
Cited
US1390843A
Cited
US1783545A
Cited
US1902466A
Cited
GB295044A
Cited
GB322199A
Cited
US1815516A
Cited
US1953519A
Cited
DE661540C
Cited
US1955322A
Cited
US2085060A
Cited
US2078688A
Cited
US2136695A
Cited
US2230558A
Cited
US2445051A
Cited
US2444472A
Cited
US2440984A
Cited
US2568701A
Cited
US2486250A
Cited
US2450286A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-09 | 1958-02-08 | 1958-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-09 | 1962-02-08 | 1962-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-09 | 1966-02-08 | 1966-08-10 | $7700.00 | Window Closed / Lapsed |