Patent US5067073A successfully refreshed from Google Patents.
US2561462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic core and manufacture thereof
Assignee: AT&T Inc
•
Filing: 1944-11-30
•
Granted: 1951-07-24
•
Expires: 1964-11-30
Abstract
No abstract record available.
Inventors
- 👤 Kenneth G Compton
- 👤 Harold L B Gould
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:54
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/0206; H01F41/0213; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071; Y10T29/49075; Y10T29/49078
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1065090A
Cited
GB289509A
Cited
US1897902A
Cited
US1720943A
Cited
US1899591A
Cited
GB393869A
Cited
US2214876A
Cited
US2222195A
Cited
US2321439A
Cited
FR836077A
Cited
US2238667A
Cited
US2236861A
Cited
US2221983A
Cited
US2293951A
Cited
US2261983A
Cited
US2372074A
Cited
US2342850A
Cited
US2406820A
Cited
US2501846A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-23 | 1955-01-22 | 1955-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-23 | 1959-01-22 | 1959-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-23 | 1963-01-22 | 1963-07-24 | $7700.00 | Window Closed / Lapsed |