US2975136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving the color stability of hydrocarbons with hydrazines
Assignee: Sunoco Inc
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Filing: 1956-01-17
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Granted: 1961-03-14
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Expires: 1976-01-17
Abstract
No abstract record available.
Inventors
- 👤 Charles L Thomas
- 👤 Archibald P Stuart
- 👤 Habet M Khelghatian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:32
CPC Classifications
C; C10; C10G; C10G29/00; C10G29/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
63 words
PROCESS FOR IMPROVING THE COLOR STABILITY OF HYDROCARBON MATERIAL WHICH COMPRISES CONTACTING A NORMALLY LIQUID PETROLEUM HYDROCARBON FRACTION WITH A HYDROXYALKYL HYDRAZINE CONTAINING AT LEAST ONE HYDROGEN ATOM ATTACHED TO A NITROGEN ATOM IN THE MOLECULE, THEREBY TO REACT THE HYDROXYALKYL HYDRAZINE WITH CONSTITUENTS OF THE HYDROCARBON MATERIAL WHICH NORMALLY CAUSE POOR COLOR STABILITY, AND SEPARATING THE REASON PRODUCTS FROM THE TREATED FRACTION.
Claim 2
Dependent Claim
63 words
PROCESS FOR IMPROVING THE COLOR STABILITY OF HYDROCARBON MATERIAL WHICH COMPRISES CONTACTING A NORMALLY LIQUID PETROLEUM HYDROCARBON FRACTION WITH A HYDROXYALKYL HYDRAZINE CONTAINING AT LEAST ONE HYDROGEN ATOM ATTACHED TO A NITROGEN ATOM IN THE MOLECULE, THEREBY TO REACT THE HYDROXYALKYL HYDRAZINE WITH CONSTITUENTS OF THE HYDROCARBON MATERIAL WHICH NORMALLY CAUSE POOR COLOR STABILITY, AND SEPARATING THE REASON PRODUCTS FROM THE TREATED FRACTION.
Claim 3
Dependent Claim
20 words
PROCESS ACCORDING TO CLAIM 1 WHERE THE PRODUCT OF SUCH CONTACTING IS DISTILLED TO OBTAIN DISTILLATES HAVING IMPROVED COLOR STABILITY.
Claim 4
Dependent Claim
28 words
PROCESS ACCORDING TO CLAIM 1 WHEREIN THE AMOUNT OF SAID TREATING AGENT IS WITHIN THE APPROXIMATE RANGE FROM 0.005 TO 0.5 WEIGHT PERCENT BASED ON SAID HYDROCARBON FRACTION.
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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) | 1964-03-13 | 1964-09-12 | 1965-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-13 | 1968-09-12 | 1969-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-13 | 1972-09-12 | 1973-03-14 | $7700.00 | Window Closed / Lapsed |