US2350160A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtering apparatus and method
Assignee: Individual
•
Filing: 1940-06-07
•
Granted: 1944-05-30
•
Expires: 1960-06-07
Abstract
No abstract record available.
Inventors
- 👤 Charles E Fraser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:21
CPC Classifications
B; B01; B01D; B01D24/00; B01D24/02; B01D24/20; B01D24/205; B01D24/22; B01D24/38; B01D24/44; B01D24/46; B01D24/4605; B01D24/461; B01D24/4631; B01D24/4636; B01D24/4668; B01D24/4673
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1947-05-30 | 1947-11-29 | 1948-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-05-30 | 1951-11-29 | 1952-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-05-30 | 1955-11-29 | 1956-05-30 | $7700.00 | Window Closed / Lapsed |