US3384954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Making multitrack magnetic transducer
Assignee: International Business Machines Corp
•
Filing: 1965-12-07
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Granted: 1968-05-28
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Expires: 1985-12-07
Abstract
No abstract record available.
Inventors
- 👤 Rex C Bradford
- 👤 Henry R Kelsof
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:12
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/1871; G11B5/29; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49041; Y10T29/49048; Y10T29/49055; Y10T29/49069
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3145452A
Cited
US3082509A
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US3283396A
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US3319232A
Cited
US3246383A
Cited
US3224073A
Cited
US3330033A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-28 | 1971-11-27 | 1972-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-28 | 1975-11-27 | 1976-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-28 | 1979-11-27 | 1980-05-28 | $7700.00 | Window Closed / Lapsed |