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Patent US3484728A successfully refreshed from Google Patents.
US3484728A
Expired / Lapsed
US
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Adjustable strength electro-magnet with constant air gap
Assignee: ITE Imperial Corp
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Filing: 1967-08-21
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Granted: 1969-12-16
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Expires: 1987-08-21
Abstract
No abstract record available.
Inventors
- 👤 Howard R Shaffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:30
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01H; H01H71/00; H01H71/74; H01H71/7463
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3179769A
Cited
US3181041A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-15 | 1973-06-16 | 1973-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-15 | 1977-06-16 | 1977-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-15 | 1981-06-16 | 1981-12-16 | $7700.00 | Window Closed / Lapsed |