Patent US2673040A successfully refreshed from Google Patents.
US2673040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording and reproducing apparatus
Assignee: Clevite Corp
•
Filing: 1947-10-28
•
Granted: 1954-03-23
•
Expires: 1967-10-28
Abstract
No abstract record available.
Inventors
- 👤 Alfred L W Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:57
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/10; G11B27/34; G11B15/00; G11B15/02; G11B15/10; G11B15/18; G11B15/22; G11B15/43; G11B15/46; G11B15/48; G11B15/60; G11B15/66
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US681145A
Cited
US1175677A
Cited
US1414941A
Cited
GB313672A
Cited
US1981370A
Cited
US2157259A
Cited
US2231279A
Cited
US2477146A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-22 | 1957-09-21 | 1958-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-22 | 1961-09-21 | 1962-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-22 | 1965-09-21 | 1966-03-23 | $7700.00 | Window Closed / Lapsed |