Patent US2521284A successfully refreshed from Google Patents.
US2521284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Authorizer
Assignee: Individual
•
Filing: 1943-01-25
•
Granted: 1950-09-05
•
Expires: 1963-01-25
Abstract
No abstract record available.
Inventors
- 👤 Jerome L Clough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:18
CPC Classifications
G; G09; G09F; G09F11/00; G09F11/12; G09F11/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US302723A
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US556136A
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US1065337A
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US1402075A
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US1563382A
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US1684683A
Cited
US1865057A
Cited
US1930540A
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US1861718A
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US1957120A
Cited
US2202419A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |