US2491139A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Closure for cylindrical filter cases
Assignee: Individual
•
Filing: 1947-05-21
•
Granted: 1949-12-13
•
Expires: 1967-05-21
Abstract
No abstract record available.
Inventors
- 👤 Charles W Simonsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:40
CPC Classifications
B; B01; B01D; B01D27/00; B01D27/08; Y; Y10; Y10T; Y10T292/00; Y10T292/20; Y10T292/205; Y10T292/209
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |