US2759607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flotation of hydrocarbon impurities
Assignee: Union Oil Company of California
•
Filing: 1951-02-27
•
Granted: 1956-08-21
•
Expires: 1971-02-27
Abstract
No abstract record available.
Inventors
- 👤 Thomas F G Boyd
- 👤 Paul W Fischer
- 👤 Robert T Wheeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:33
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/012; B03D1/008; B03D2203/00; B03D2203/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A METHOD FOR TREATING A FEED LIQUID TO SEPARATE HYDROCARBON OIL IMPURITIES FROM WATER WHICH COMPRISES SUBJECTING SAID FEED LIQUID TO CONTACT WITH A FLOTATION GAS IN THE PRESENCE OF A CHEMICAL COMPRISING A SUBSTITUTED PARTIAL ESTER OF A POLYHYDRIC ALCOHOL AND A FATTY ACID, SELECTED FROM THE CLASS CONSISTING OF THE HYDROXYPOLYOXYETHYLENE-SUBSTITUTED PARTIAL ESTERS OF POLYHYDRIC ALCOHOLS AND FATTY ACIDS, THE ALKALI SULFONATE-SUBSTITUTED PARTIAL ESTERS OF POLYHYDRIC ALCOHOLS AND FATTY ACIDS, AND THE ALKALI CARBOXYLATE-SUBSTITUTED PARTIAL ESTERS OF POLYHYDRIC ALCOHOLS AND FATTY ACIDS.
Claim 2
Independent Claim
84 words
A METHOD FOR TREATING A FEED LIQUID TO SEPARATE HYDROCARBON OIL IMPURITIES FROM WATER WHICH COMPRISES SUBJECTING SAID FEED LIQUID TO CONTACT WITH A FLOTATION GAS IN THE PRESENCE OF A CHEMICAL COMPRISING A SUBSTITUTED PARTIAL ESTER OF A POLYHYDRIC ALCOHOL AND A FATTY ACID, SELECTED FROM THE CLASS CONSISTING OF THE HYDROXYPOLYOXYETHYLENE-SUBSTITUTED PARTIAL ESTERS OF POLYHYDRIC ALCOHOLS AND FATTY ACIDS, THE ALKALI SULFONATE-SUBSTITUTED PARTIAL ESTERS OF POLYHYDRIC ALCOHOLS AND FATTY ACIDS, AND THE ALKALI CARBOXYLATE-SUBSTITUTED PARTIAL ESTERS OF POLYHYDRIC ALCOHOLS AND FATTY ACIDS.
References Cited (Backward Citations)
US579581A
Cited
US1192569A
Cited
US1116903A
Cited
US1187772A
Cited
US1201934A
Cited
US1505944A
Cited
DE416284C
Cited
US1600762A
Cited
US1717223A
Cited
US1943180A
Cited
US1958325A
Cited
US2220574A
Cited
US2222728A
Cited
US2289996A
Cited
US2312466A
Cited
US2278107A
Cited
US2337118A
Cited
US2380166A
Cited
US2446655A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-21 | 1960-02-20 | 1960-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-21 | 1964-02-20 | 1964-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-21 | 1968-02-20 | 1968-08-21 | $7700.00 | Window Closed / Lapsed |