US3370282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasion resistant magnetic head
Assignee: Rank Bush Murphy Ltd
•
Filing: 1964-01-03
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Granted: 1968-02-20
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Expires: 1984-01-03
Abstract
No abstract record available.
Inventors
- 👤 Baldwin John Lewis Edwin
- 👤 Blaxtan Peter William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:29
CPC Classifications
G; G11; G11B; 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) | 1971-02-19 | 1971-08-21 | 1972-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-19 | 1975-08-21 | 1976-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-19 | 1979-08-21 | 1980-02-20 | $7700.00 | Window Closed / Lapsed |