Patent US3443161A successfully refreshed from Google Patents.
Patent US2584551A successfully refreshed from Google Patents.
US2584551A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtering apparatus
Assignee: Individual
•
Filing: 1949-03-11
•
Granted: 1952-02-05
•
Expires: 1969-03-11
Abstract
No abstract record available.
Inventors
- 👤 Herbert I Chambers
- 👤 Louis B Ehrlich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:57
CPC Classifications
B; B01; B01D; B01D27/00; B01D27/02; B01D27/08; Y; Y10; Y10T; Y10T292/00; Y10T292/08; Y10T292/1099
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1884615A
Cited
US1937415A
Cited
US2239868A
Cited
US2325399A
Cited
US2346723A
Cited
US2473727A
Cited
US2468862A
Cited
US2427733A
Cited
US2525330A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-04 | 1955-08-06 | 1956-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-04 | 1959-08-06 | 1960-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-04 | 1963-08-06 | 1964-02-05 | $7700.00 | Window Closed / Lapsed |