US3512146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic tape recording methods
Assignee: Schlumberger Technology Corp
•
Filing: 1968-08-26
•
Granted: 1970-05-12
•
Expires: 1988-08-26
Abstract
No abstract record available.
Inventors
- 👤 John S Smith
- 👤 Arthur A Cavelos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:45
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/20; G06; G06F; G06F7/00; G06F7/22; G06F7/32; G11B27/00; G11B27/02; G11B27/031; G11B27/032
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2986725A
Cited
US3184581A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-11 | 1973-11-10 | 1974-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-11 | 1977-11-10 | 1978-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-11 | 1981-11-10 | 1982-05-12 | $7700.00 | Window Closed / Lapsed |