Patent US2567174A successfully refreshed from Google Patents.
US2567174A
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Process for improving stability and engine cleanliness characteristics of petroleum fractions
Assignee: Standard Oil Development Co
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Filing: 1949-01-24
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Granted: 1951-09-11
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Expires: 1969-01-24
Abstract
No abstract record available.
Inventors
- 👤 Arundale Erving
- 👤 Joseph P Haworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:35
CPC Classifications
C; C10; C10G; C10G29/00; C10G29/20; C10G29/22; C10G29/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
PROCESS FOR THE REFINING OF PETROLEUM FRACTIONS BOILING BELOW ABOUT 370 C. TO IMPROVE STABILITY AND ENGINE CLEANLINESS WHICH COMPRISES CONTACTING SAID PETROLEUM FRACTION WITH A TREATING AGENT CONSISTING SOLELY OF FORMALDEHYDE AT A
Claim 2
Dependent Claim
34 words
PROCESS FOR THE REFINING OF PETROLEUM FRACTIONS BOILING BELOW ABOUT 370 C. TO IMPROVE STABILITY AND ENGINE CLEANLINESS WHICH COMPRISES CONTACTING SAID PETROLEUM FRACTION WITH A TREATING AGENT CONSISTING SOLELY OF FORMALDEHYDE AT A
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) | 1954-09-10 | 1955-03-12 | 1955-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-10 | 1959-03-12 | 1959-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-10 | 1963-03-12 | 1963-09-11 | $7700.00 | Window Closed / Lapsed |