US2723725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dust separating and recovering apparatus
Assignee: Individual
•
Filing: 1954-05-18
•
Granted: 1955-11-15
•
Expires: 1974-05-18
Abstract
No abstract record available.
Inventors
- 👤 Charles J Keiffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:17
CPC Classifications
B; B01; B01D; B01D45/00; B01D45/04; B01D45/08
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-14 | 1959-05-16 | 1959-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-14 | 1963-05-16 | 1963-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-14 | 1967-05-16 | 1967-11-15 | $7700.00 | Window Closed / Lapsed |