US2988673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compensated electromagnetic devices
Assignee: HAGEN Corp
•
Filing: 1957-01-14
•
Granted: 1961-06-13
•
Expires: 1977-01-14
Abstract
No abstract record available.
Inventors
- 👤 Robert E Harkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:22
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/066
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1411311A
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US1903685A
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US1999347A
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GB456947A
Cited
US2112542A
Cited
US2347563A
Cited
US2685200A
Cited
US2788664A
Cited
US2780101A
Cited
US2885604A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |