US2743017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple stage filter
Assignee: Purolator Products Inc
•
Filing: 1954-05-10
•
Granted: 1956-04-24
•
Expires: 1974-05-10
Abstract
No abstract record available.
Inventors
- 👤 Julius P Kovacs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:41
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/21
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1251601A
Cited
US1937415A
Cited
US2271054A
Cited
US2543165A
Cited
US2582340A
Cited
US2533192A
Cited
US2584551A
Cited
GB681379A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-24 | 1959-10-24 | 1960-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-24 | 1963-10-24 | 1964-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-24 | 1967-10-24 | 1968-04-24 | $7700.00 | Window Closed / Lapsed |