US3564523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple track magnetic tape recording apparatus
Assignee: Schlumberger Technology Corp
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Filing: 1967-11-22
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Granted: 1971-02-16
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Expires: 1987-11-22
Abstract
Abstract APPARATUS IS PROVIDED FOR THE TRANSFER OF AN INFORMATION DATA SIGNAL HAVING MORE BITS THAN THERE ARE CORRESPONDING RECORDING HEADS AND TRACKS ON THE TAPE. TRANSFER OF THE INFORMATION IS ACCOMPLISHED BY THE SUCCESSIVE RECORDING OF GROUPS O BITS WHICH TOGETHER COMPRISE THE INFORMATION SIGNAL.
Inventors
- 👤 Arthur A Cavelos
- 👤 John S Smith
- 👤 Bernard Viguerie-Noel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:03
CPC Classifications
G; G01; G01V; G01V11/00; G01V11/002; E; E21; E21B; E21B47/00; E21B47/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |