US2933555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for modulating a magnetic field for electrical reproduction
Assignee: Individual
•
Filing: 1953-02-09
•
Granted: 1960-04-19
•
Expires: 1973-02-09
Abstract
No abstract record available.
Inventors
- 👤 William A Wootten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:01
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/115; G11B11/105; G11B11/10532; G11B11/10534; G11B11/10539; G11B11/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2165307A
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US2260063A
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US2517808A
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US2698928A
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US2720558A
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US2657377A
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US2724021A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-19 | 1963-10-19 | 1964-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-19 | 1967-10-19 | 1968-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-19 | 1971-10-19 | 1972-04-19 | $7700.00 | Window Closed / Lapsed |