Patent US2969435A successfully refreshed from Google Patents.
US2969435A
Expired / Lapsed
US
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Oil film spacer for magnetic recording device
Assignee: International Business Machines Corp
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Filing: 1955-02-07
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Granted: 1961-01-24
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Expires: 1975-02-07
Abstract
No abstract record available.
Inventors
- 👤 John J Lynott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:16
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/50; G11B5/00; G11B5/48; G11B5/58; G11B5/60; G11B5/6005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1990548A
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US2426838A
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US2656420A
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US2629605A
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US2787750A
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US2612566A
Cited
US2772135A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-24 | 1964-07-25 | 1965-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-24 | 1968-07-25 | 1969-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-24 | 1972-07-25 | 1973-01-24 | $7700.00 | Window Closed / Lapsed |