Patent US412261A successfully refreshed from Google Patents.
US3411202A
Expired / Lapsed
US
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Method of manufacturing recording heads
Assignee: International Business Machines Corp
•
Filing: 1964-06-25
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Granted: 1968-11-19
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Expires: 1984-06-25
Abstract
No abstract record available.
Inventors
- 👤 Schwartz Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:51
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/1272; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49048; Y10T29/49055
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3123748A
Cited
US2677019A
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US3040301A
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US2961709A
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US3247573A
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US3229265A
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US3339190A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-19 | 1972-05-20 | 1972-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-19 | 1976-05-20 | 1976-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-19 | 1980-05-20 | 1980-11-19 | $7700.00 | Window Closed / Lapsed |