Patent US3398870A successfully refreshed from Google Patents.
US3398870A
Expired / Lapsed
US
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Controlled air film bearing
Assignee: International Business Machines Corp
•
Filing: 1967-01-23
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Granted: 1968-08-27
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Expires: 1987-01-23
Abstract
No abstract record available.
Inventors
- 👤 Philip J Mullan
- 👤 Platter Sandford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:10
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/06; F16C33/10; F16C33/1025; F16C33/106; F16C33/107; F16C17/00; F16C17/02; F16C17/026; G; G11; G11B; G11B15/00; G11B15/60; G11B15/62; G11B15/64; G11B17/00; G11B17/32; F16C2370/00; F16C2370/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-27 | 1972-02-26 | 1972-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-27 | 1976-02-26 | 1976-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-27 | 1980-02-26 | 1980-08-27 | $7700.00 | Window Closed / Lapsed |