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Patent US3416148A successfully refreshed from Google Patents.
US3416148A
Expired / Lapsed
US
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Compound radius transducer head
Assignee: International Business Machines Corp
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Filing: 1964-12-23
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Granted: 1968-12-10
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Expires: 1984-12-23
Abstract
No abstract record available.
Inventors
- 👤 Donald G Berghaus
- 👤 Albert N Garthwaite
- 👤 Tiao Hui-Li
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:29
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/60; G11B15/62; G11B15/64; G11B5/00; G11B5/127; G11B5/187
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) | 1971-12-10 | 1972-06-10 | 1972-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-10 | 1976-06-10 | 1976-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-10 | 1980-06-10 | 1980-12-10 | $7700.00 | Window Closed / Lapsed |