US2427018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permanent magnet materials
Assignee: AT&T Inc
•
Filing: 1944-01-15
•
Granted: 1947-09-09
•
Expires: 1964-01-15
Abstract
No abstract record available.
Inventors
- 👤 Ethan A Nesbitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:12
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1338134A
Cited
US1489243A
Cited
US1715646A
Cited
US1894836A
Cited
US1715648A
Cited
AT143301B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-09-08 | 1951-03-10 | 1951-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-09-08 | 1955-03-10 | 1955-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-09-08 | 1959-03-10 | 1959-09-09 | $7700.00 | Window Closed / Lapsed |