US2454259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-cleaning screen structure
Assignee: Individual
•
Filing: 1945-04-30
•
Granted: 1948-11-16
•
Expires: 1965-04-30
Abstract
No abstract record available.
Inventors
- 👤 Rolland O Shadday
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:48
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US396799A
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US1565380A
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US1876439A
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US719913A
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US743091A
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US1424197A
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US1593082A
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US1573067A
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US1649241A
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US1843242A
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US2158080A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-16 | 1952-05-17 | 1952-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-16 | 1956-05-17 | 1956-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-16 | 1960-05-17 | 1960-11-16 | $7700.00 | Window Closed / Lapsed |