Patent US2968762A successfully refreshed from Google Patents.
Patent US3237770A successfully refreshed from Google Patents.
US3237770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter apparatus
Assignee: Dana Inc
•
Filing: 1963-03-06
•
Granted: 1966-03-01
•
Expires: 1983-03-06
Abstract
No abstract record available.
Inventors
- 👤 Jr Kingsley E Humbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:05
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/005; Y; Y10; Y10T; Y10T70/00; Y10T70/50
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1705019A
Cited
FR783203A
Cited
US2215053A
Cited
US2180633A
Cited
US2359475A
Cited
US2630228A
Cited
USRE24509E
Cited
US3060785A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |