Patent US3423744A successfully refreshed from Google Patents.
US3423744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Binary magnetic recording system
Assignee: NCR Voyix Corp
•
Filing: 1965-05-24
•
Granted: 1969-01-21
•
Expires: 1985-05-24
Abstract
No abstract record available.
Inventors
- 👤 Richard K Gerlach
- 👤 Robert A Melnick
- 👤 Noboru Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:09
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/18; G06; G06K; G06K1/00; G06K1/12; G06K7/00; G06K7/08; G11B20/14; G11B20/1403; G11B20/1407; G11B20/1419
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2813259A
Cited
US2972735A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |