US2775347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for screening materials
Assignee: Individual
•
Filing: 1953-07-28
•
Granted: 1956-12-25
•
Expires: 1973-07-28
Abstract
No abstract record available.
Inventors
- 👤 Weston David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:14
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/28; B07B1/284
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US454065A
Cited
GB190703383A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-25 | 1960-06-25 | 1960-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-25 | 1964-06-25 | 1964-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-25 | 1968-06-25 | 1968-12-25 | $7700.00 | Window Closed / Lapsed |