Patent US4327276A successfully refreshed from Google Patents.
Patent US2952624A successfully refreshed from Google Patents.
US2952624A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acid purification of hydrocarbon lubricants contaminated by aluminum salts
Assignee: Alcan Research and Development Ltd
•
Filing: 1957-08-05
•
Granted: 1960-09-13
•
Expires: 1977-08-05
Abstract
No abstract record available.
Inventors
- 👤 Lister Leslie
- 👤 Francis M P Meredith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:22
CPC Classifications
C; C10; C10G; C10G17/00; C10G17/02; C10G17/04; C10G17/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A METHOD OF CLEANSING VOLATILE HYDROCARBONS CONTAMINATED WITH FATTY ACID SALTS OF ALUMINUM COMPRISING VIGOROUSLY MIXING THE HYDROCARBON WITH AQUEOUS NITRIC ACID OF A STRENGTH WITHIN THE RANGE OF 5-50% AND IN AN AMOUNT AT LEAST EQUAL TO THE STOICHIOMETRICAL AMOUNT REQUIRED TO DECOMPOSE ALL THE FATTY ACID SALT OF ALUMINUM PRESENT IN THE VOLATILE HYDROCARBON AND SUBSEQUENTLY SEPARATING THE HYDROCARBN FROM THE SPENT ACQUEOUS NITRIC ACID.
Claim 2
Independent Claim
67 words
A METHOD OF CLEANSING VOLATILE HYDROCARBONS CONTAMINATED WITH FATTY ACID SALTS OF ALUMINUM COMPRISING VIGOROUSLY MIXING THE HYDROCARBON WITH AQUEOUS NITRIC ACID OF A STRENGTH WITHIN THE RANGE OF 5-50% AND IN AN AMOUNT AT LEAST EQUAL TO THE STOICHIOMETRICAL AMOUNT REQUIRED TO DECOMPOSE ALL THE FATTY ACID SALT OF ALUMINUM PRESENT IN THE VOLATILE HYDROCARBON AND SUBSEQUENTLY SEPARATING THE HYDROCARBN FROM THE SPENT ACQUEOUS NITRIC ACID.
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) | 1963-09-13 | 1964-03-14 | 1964-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-13 | 1968-03-14 | 1968-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-13 | 1972-03-14 | 1972-09-13 | $7700.00 | Window Closed / Lapsed |