Patent US3353166A successfully refreshed from Google Patents.
US3353166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxide coated magnetic recording medium
Assignee: International Business Machines Corp
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Filing: 1963-10-23
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Granted: 1967-11-14
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Expires: 1983-10-23
Abstract
No abstract record available.
Inventors
- 👤 George W Brock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:30
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/72; G11B5/725
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A MAGNETIC RECORDING DEVICE COMPRISING: A MAGNETIC RECORD MEMBER INCLUDING A MAGNETIZABLE MATERIAL FORMING A SURFACE PORTION, SAID SURFACE PORTION HAVING FORMED IN PLACE THEREON BY AN OXIDIZING PROCESS EFFECTED DIRECTLY ON THE MAGNETIZABLE MATERIAL A THIN PROTECTIVE OXIDE FILM OF SAID MAGNETIZABLE MATERIAL, AND
Claim 2
Dependent Claim
45 words
A MAGNETIC RECORDING DEVICE COMPRISING: A MAGNETIC RECORD MEMBER INCLUDING A MAGNETIZABLE MATERIAL FORMING A SURFACE PORTION, SAID SURFACE PORTION HAVING FORMED IN PLACE THEREON BY AN OXIDIZING PROCESS EFFECTED DIRECTLY ON THE MAGNETIZABLE MATERIAL A THIN PROTECTIVE OXIDE FILM OF SAID MAGNETIZABLE MATERIAL, AND
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) | 1970-11-13 | 1971-05-15 | 1971-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-13 | 1975-05-15 | 1975-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-13 | 1979-05-15 | 1979-11-14 | $7700.00 | Window Closed / Lapsed |