Patent US3443368A successfully refreshed from Google Patents.
US3443368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular centrifugal separators
Assignee: Shell USA Inc
•
Filing: 1966-07-26
•
Granted: 1969-05-13
•
Expires: 1986-07-26
Abstract
No abstract record available.
Inventors
- 👤 Joseph G Wilson
- 👤 Harvey L Franzel
- 👤 Le Roy H Markway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:32
CPC Classifications
B; B04; B04C; B04C5/00; B04C5/12; B04C5/13; B04C5/08; B04C5/085; B01; B01D; B01D45/00; B01D45/12; B01D45/16; B04C5/14
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US711026A
Cited
US1801044A
Cited
US1922013A
Cited
US1844369A
Cited
US2846024A
Cited
US3057148A
Cited
US2960184A
Cited
US2986278A
Cited
US2887177A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-12 | 1972-11-11 | 1973-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-12 | 1976-11-11 | 1977-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-12 | 1980-11-11 | 1981-05-13 | $7700.00 | Window Closed / Lapsed |