US2528279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple recorder
Assignee: IIT Research Institute
•
Filing: 1945-10-19
•
Granted: 1950-10-31
•
Expires: 1965-10-19
Abstract
No abstract record available.
Inventors
- 👤 Haldon A Leedy
- 👤 Camras Marvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:30
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/86
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1555281A
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US1726546A
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US1811817A
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US1975929A
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US2023348A
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US2058415A
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US2106350A
Cited
US2297242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-30 | 1954-05-01 | 1954-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-30 | 1958-05-01 | 1958-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-30 | 1962-05-01 | 1962-10-31 | $7700.00 | Window Closed / Lapsed |