Patent US3222275A successfully refreshed from Google Patents.
US3222275A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for removing naphthenic acids from mineral oils
Assignee: Union Oil Company of California
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Filing: 1964-07-13
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Granted: 1965-12-07
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Expires: 1984-07-13
Abstract
No abstract record available.
Inventors
- 👤 William A Krewer
- 👤 Donald L Klass
- 👤 George W Ayers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:14
CPC Classifications
C; C10; C10G; C10G29/00; C10G29/20; C10G29/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
A METHOD OF REMOVING NAPHTHENIC ACIDS FROM A PETROLEUM FRACTION WHICH COMPRISES MIXING AQUEOUS ALKALI METAL HYDROXIDE AND A COMPOUND HAVING A STRUCTURAL FORMULA SELECTED FROM THE GROUP CONSISTING OF
Claim 2
Independent Claim
30 words
A METHOD OF REMOVING NAPHTHENIC ACIDS FROM A PETROLEUM FRACTION WHICH COMPRISES MIXING AQUEOUS ALKALI METAL HYDROXIDE AND A COMPOUND HAVING A STRUCTURAL FORMULA SELECTED FROM THE GROUP CONSISTING OF
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |