Patent US4521857A successfully refreshed from Google Patents.
US2941129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical coil
Assignee: AT&T Inc
•
Filing: 1955-05-25
•
Granted: 1960-06-14
•
Expires: 1975-05-25
Abstract
No abstract record available.
Inventors
- 👤 Sheldon H Horn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:27
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/04; H01F41/12; H01F41/122; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1815620A
Cited
US2122894A
Cited
US2118924A
Cited
US2166841A
Cited
US2241761A
Cited
US2488468A
Cited
US2460556A
Cited
US2691811A
Cited
US2728879A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |