US2983677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for flotation of hydrocarbon impurities
Assignee: Union Oil Company of California
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Filing: 1955-12-12
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Granted: 1961-05-09
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Expires: 1975-12-12
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 10:48
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/01; B03D1/011; B03D2203/00; B03D2203/006
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
64 words
A METHOD FOR TREATING AN AQUEOUS LIQUID TO SEPARATE OIL IMPURITIES CONTAINED THEREIN WHICH COMPRISES SUBJECTING SAID LIQUID TO CONTACT WITH A FLOTATION GAS IN THE PRESENCE OF A CHEMICAL COMPRISING A WATER-DISPERSIBLE AMINO COMPOUND SELECTED FROM THE CLASS CONSISTING OF N-PHENYLMORPHOLINE, QUATERNARY AMMONIUM SALTS HAVING AT LEAST 10 CARBON ATOMS AS HYDROCARBON GROUPS ATTACHED TO THE PENTAVALENT NITROGEN, PRIMARY ROSIN, ALKYL AND ALKENYL
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-08 | 1964-11-07 | 1965-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-08 | 1968-11-07 | 1969-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-08 | 1972-11-07 | 1973-05-09 | $7700.00 | Window Closed / Lapsed |