US2919312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic heads
Assignee: Siemens and Halske AG
•
Filing: 1954-03-16
•
Granted: 1959-12-29
•
Expires: 1974-03-16
Abstract
No abstract record available.
Inventors
- 👤 Rosenberger Georg
- 👤 Neumann Helmut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:34
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/23; G11B5/235; G11B5/133; G11B5/193; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49055; Y10T29/4906
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2456767A
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US2612681A
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US2585932A
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DE807725C
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US2628286A
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US2715659A
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US2632816A
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US2676392A
Cited
US2658114A
Cited
US2711945A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-28 | 1963-06-29 | 1963-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-28 | 1967-06-29 | 1967-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-28 | 1971-06-29 | 1971-12-29 | $7700.00 | Window Closed / Lapsed |