Patent US2672239A successfully refreshed from Google Patents.
US2672239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous filter with internal heat exchanges and automatic removal of sediments
Assignee: Individual
•
Filing: 1950-10-25
•
Granted: 1954-03-16
•
Expires: 1970-10-25
Abstract
No abstract record available.
Inventors
- 👤 Baril Fernand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:18
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/114; B01D29/117; B01D29/50; B01D29/52; B01D29/54; B01D29/62; B01D29/64; B01D29/6469; B01D29/6484; B01D29/76; B01D29/80; B01D29/84; B01D29/846
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US487323A
Cited
US856332A
Cited
US1247979A
Cited
US1219796A
Cited
US1866970A
Cited
US1877157A
Cited
US1987142A
Cited
US2189458A
Cited
US2300849A
Cited
US2354645A
Cited
US2521347A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-15 | 1957-09-14 | 1958-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-15 | 1961-09-14 | 1962-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-15 | 1965-09-14 | 1966-03-16 | $7700.00 | Window Closed / Lapsed |