US2190667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permanent magnet alloy
Assignee: AT&T Inc
•
Filing: 1938-04-09
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Granted: 1940-02-20
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Expires: 1958-04-09
Abstract
No abstract record available.
Inventors
- 👤 George A Kelsall
- 👤 Ethan A Nesbitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:08
CPC Classifications
C; C21; C21C; C21C7/00; C22; C22C; C22C19/00; C22C19/07; C22C38/00; C22C38/12; C22F; C22F1/00; C22F1/10; G; G01; G01R; G01R1/00; G01R1/02; G01R1/16; Y; Y10; Y10S; Y10S29/00; Y10S29/028; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/928; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12931
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) | 1943-02-19 | 1943-08-21 | 1944-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-02-19 | 1947-08-21 | 1948-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-02-19 | 1951-08-21 | 1952-02-20 | $7700.00 | Window Closed / Lapsed |