Patent US3514851A successfully refreshed from Google Patents.
US3514851A
Expired / Lapsed
US
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Method of manufacturing a magnetic head structure
Assignee: Control Data Corp
•
Filing: 1967-04-03
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Granted: 1970-06-02
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Expires: 1987-04-03
Abstract
No abstract record available.
Inventors
- 👤 Robert L Perkins
- 👤 Beat G Keel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:01
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/1871; G11B5/265; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49048
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1882526A
Cited
US2787854A
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US3106617A
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US3247572A
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US3244818A
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US3353261A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-01 | 1973-12-01 | 1974-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-01 | 1977-12-01 | 1978-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-01 | 1981-12-01 | 1982-06-02 | $7700.00 | Window Closed / Lapsed |