US2958037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic shield for coils
Assignee: University of Minnesota Twin Cities
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Filing: 1957-02-08
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Granted: 1960-10-25
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Expires: 1977-02-08
Abstract
No abstract record available.
Inventors
- 👤 John R Riede
- 👤 Robert C Cahill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:45
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/34; H01F27/36; H01F27/361
Claims Analysis
Total Claims: 0
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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) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |