Patent US2415993A successfully refreshed from Google Patents.
US2415993A
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US
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Gyratory screen, rubber munted spring support
Assignee: Individual
•
Filing: 1945-03-07
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Granted: 1947-02-18
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Expires: 1965-03-07
Abstract
No abstract record available.
Inventors
- 👤 Cottrell William Percival
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:18
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/28; B07B1/284; Y; Y10; Y10S; Y10S241/00; Y10S241/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2246483A
Cited
US1036313A
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US1879923A
Cited
US2157562A
Cited
US2200724A
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US2140172A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-02-17 | 1950-08-19 | 1951-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-02-17 | 1954-08-19 | 1955-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-02-17 | 1958-08-19 | 1959-02-18 | $7700.00 | Window Closed / Lapsed |