US2428864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnet
Assignee: Individual
•
Filing: 1945-07-05
•
Granted: 1947-10-14
•
Expires: 1965-07-05
Abstract
No abstract record available.
Inventors
- 👤 Charles R Boyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:01
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/02; H01F7/0231; H01F7/0252; H01F7/0257
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US470777A
Cited
US512381A
Cited
US1259603A
Cited
US1741969A
Cited
US1772126A
Cited
US1997231A
Cited
US2218825A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-13 | 1951-04-14 | 1951-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-13 | 1955-04-14 | 1955-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-13 | 1959-04-14 | 1959-10-14 | $7700.00 | Window Closed / Lapsed |