US2999766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic signal carriers
Assignee: Metropolitan Vickers Electrical Co Ltd
•
Filing: 1958-02-03
•
Granted: 1961-09-12
•
Expires: 1978-02-03
Abstract
No abstract record available.
Inventors
- 👤 Ashworth Fred
- 👤 Knowles Alfred John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:07
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/14; H01F41/20; C; C23; C23C; C23C14/00; C23C14/02; C23C14/028; C23C14/06; C23C14/14; C23C14/16; G; G11; G11B; G11B5/00; G11B5/004
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US836339A
Cited
US1982774A
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US2185300A
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US2443756A
Cited
GB670993A
Cited
US2671034A
Cited
US2794180A
Cited
US2900282A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-11 | 1965-03-13 | 1965-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-11 | 1969-03-13 | 1969-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-11 | 1973-03-13 | 1973-09-12 | $7700.00 | Window Closed / Lapsed |