US3401397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tape recording mechanism with endless magnetic tape stored in a figure 8
Assignee: Schlumberger Technology Corp
•
Filing: 1967-06-13
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Granted: 1968-09-10
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Expires: 1987-06-13
Abstract
No abstract record available.
Inventors
- 👤 James T Blakistone
- 👤 Karsh Irving
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:45
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/60; G11B15/66; G11B15/665; G11B15/6651; G11B15/18; G11B15/1883; G11B15/1891
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1459795A
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US2044267A
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US3126162A
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US3088687A
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US3155335A
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US3106355A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-10 | 1972-03-11 | 1972-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-10 | 1976-03-11 | 1976-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-10 | 1980-03-11 | 1980-09-10 | $7700.00 | Window Closed / Lapsed |