Patent FR923988A successfully refreshed from Google Patents.
Patent US2534760A successfully refreshed from Google Patents.
US2534760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtering apparatus
Assignee: —
•
Filing: —
•
Granted: 1950-12-19
•
Expires: 1967-12-19
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:52
CPC Classifications
B; B01; B01D; B01D37/00; B01D37/02; B01D33/00; B01D33/04; B01D33/06; B01D33/073; B01D33/44; B01D33/46; B01D33/466; B01D33/48; B01D33/50; B01D33/58; B01D33/70; B01D33/76
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US794173A
Cited
US1472254A
Cited
US1794433A
Cited
GB339636A
Cited
US1993055A
Cited
US2005839A
Cited
US2102780A
Cited
US2120455A
Cited
US2027652A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-18 | 1954-06-19 | 1954-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-18 | 1958-06-19 | 1958-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-18 | 1962-06-19 | 1962-12-19 | $7700.00 | Window Closed / Lapsed |