US2820550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gravity-type waste water-oil separators
Assignee: Standard Oil Co
•
Filing: 1955-06-29
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Granted: 1958-01-21
•
Expires: 1975-06-29
Abstract
No abstract record available.
Inventors
- 👤 Leonard V Sorg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:05
CPC Classifications
B; B01; B01D; B01D17/00; B01D17/02; B01D17/0208; B01D21/00; B01D21/0039; B01D21/0042; B01D21/10; B01D21/12; B01D21/18; B01D21/183; B01D21/24; B01D21/2405; B01D21/2416; B01D21/2433; B01D21/2438; B01D21/245
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US317366A
Cited
US514438A
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US917918A
Cited
US1302839A
Cited
US2254176A
Cited
US2327703A
Cited
CH242594A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |