Patent US2222425A successfully refreshed from Google Patents.
US2222425A
Expired / Lapsed
US
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Magnetic structure
Assignee: AT&T Inc
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Filing: 1938-08-20
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Granted: 1940-11-19
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Expires: 1958-08-20
Abstract
No abstract record available.
Inventors
- 👤 Herman G Wehe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:22
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/36; G01K7/38; H; H01; H01J; H01J40/00; H02; H02N; H02N10/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-11-19 | 1944-05-20 | 1944-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-11-19 | 1948-05-20 | 1948-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-11-19 | 1952-05-20 | 1952-11-19 | $7700.00 | Window Closed / Lapsed |