US2539784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic pickup arm biasing device
Assignee: Individual
•
Filing: 1944-05-20
•
Granted: 1951-01-30
•
Expires: 1964-05-20
Abstract
No abstract record available.
Inventors
- 👤 Jackson O Kleber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:02
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/02; G11B3/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US913508A
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US1242920A
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US1344186A
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US1546931A
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US1678116A
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US1742085A
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US1741465A
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US2138875A
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US2114881A
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US2324214A
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US2357034A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-29 | 1954-07-31 | 1955-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-29 | 1958-07-31 | 1959-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-29 | 1962-07-31 | 1963-01-30 | $7700.00 | Window Closed / Lapsed |