US3004111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Complementary magnetic cores for selective magnetic record readout
Assignee: Individual
•
Filing: 1957-05-24
•
Granted: 1961-10-10
•
Expires: 1977-05-24
Abstract
No abstract record available.
Inventors
- 👤 Hollingsworth R Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:42
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/49; G11B5/4969
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2053268A
Cited
GB430780A
Cited
US2291476A
Cited
US2476599A
Cited
US2540711A
Cited
US2735899A
Cited
US2517808A
Cited
US2674659A
Cited
US2776371A
Cited
GB760874A
Cited
US2922855A
Cited
US2831180A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-09 | 1965-04-10 | 1965-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-09 | 1969-04-10 | 1969-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-09 | 1973-04-10 | 1973-10-10 | $7700.00 | Window Closed / Lapsed |