US2520407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of inorganic matter from petroleum residua
Assignee: Sunoco Inc
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Filing: 1948-11-27
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Granted: 1950-08-29
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Expires: 1968-11-27
Abstract
No abstract record available.
Inventors
- 👤 Edward M Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:25
CPC Classifications
C; C10; C10G; C10G31/00; C10G31/08; C10G17/00; C10G17/02; C10G17/04; C10G17/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
METHOD OF TREATING PETROLEUM RESIDUUM CONTAINING ALKALINE NAPHTHENATES TO REMOVE INORGANIC MATTER WHICH COMPRISES MIXING THE RESIDUUM AT AN ELEVATED TEMPERATURE WITH WATER AND H2SO4 UNDER SUFFICIENT PRESSURE TO MAINTAIN THE WATER IN LIQUID PHASE, THE AMOUNT OF H2SO4 EMPLOYED BEING SUFFICIENT ONLY TO SUBSTANTIALLY NEUTRALIZE THE RESIDUUM AND THE PROPORTION OF WATER TO H2SO4 BEING EQUIVALENT TO AN ACID STRENGTH OF 60-67% H2SO4 BY WEIGHT, SAID H2SO4 BEING ADDED TO THE RESIDUUM NOT BEFORE THE ADDITION OF THE WATER, THEN VAPORIZING WATER FROM THE RESIDUUM, THEREBY FORMING SALT CRYSTALS OF RELATIVELY LARGE SIZE, AND SEPARATING SAID CRYSTALS FROM THE TREATED RESIDUUM.
Claim 2
Dependent Claim
102 words
METHOD OF TREATING PETROLEUM RESIDUUM CONTAINING ALKALINE NAPHTHENATES TO REMOVE INORGANIC MATTER WHICH COMPRISES MIXING THE RESIDUUM AT AN ELEVATED TEMPERATURE WITH WATER AND H2SO4 UNDER SUFFICIENT PRESSURE TO MAINTAIN THE WATER IN LIQUID PHASE, THE AMOUNT OF H2SO4 EMPLOYED BEING SUFFICIENT ONLY TO SUBSTANTIALLY NEUTRALIZE THE RESIDUUM AND THE PROPORTION OF WATER TO H2SO4 BEING EQUIVALENT TO AN ACID STRENGTH OF 60-67% H2SO4 BY WEIGHT, SAID H2SO4 BEING ADDED TO THE RESIDUUM NOT BEFORE THE ADDITION OF THE WATER, THEN VAPORIZING WATER FROM THE RESIDUUM, THEREBY FORMING SALT CRYSTALS OF RELATIVELY LARGE SIZE, AND SEPARATING SAID CRYSTALS FROM THE TREATED RESIDUUM.
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) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |