Patent US3036304A successfully refreshed from Google Patents.
US3036304A
Expired / Lapsed
US
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Resilient magnetic drum
Assignee: International Business Machines Corp
•
Filing: 1958-08-20
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Granted: 1962-05-22
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Expires: 1978-08-20
Abstract
No abstract record available.
Inventors
- 👤 Dennis D Willard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:21
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/60; G11B5/6005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1545897A
Cited
GB463505A
Cited
US2710191A
Cited
GB657494A
Cited
US2787750A
Cited
US2883475A
Cited
US2862845A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-21 | 1965-11-20 | 1966-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-21 | 1969-11-20 | 1970-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-21 | 1973-11-20 | 1974-05-22 | $7700.00 | Window Closed / Lapsed |