US2639304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of aromatic hydrocarbons
Assignee: Jones and Laughlin Steel Corp
•
Filing: 1952-01-11
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Granted: 1953-05-19
•
Expires: 1972-01-11
Abstract
No abstract record available.
Inventors
- 👤 Frank P Hazlett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:00
CPC Classifications
C; C10; C10G; C10G29/00; C10G29/06; C10G29/12; C07; C07C; C07C7/00; C07C7/148; C07C7/14833; C07C7/1485
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A METHOD OF REDUCING THE PERCENTAGE OF "PARAFFIN " HYDROCARBONS IN A MIXTURE OF A SMALL PERCENTAGE OF "PARAFFIN" HYDROCARBONS DISSOLVED AS NORMALLY OCCURING IMPURITIES IN A LIQUID AROMATIC HYDROCARBON PRODUCED FROM COAL, SAID "PARAFFIN" HYDROCARBONS BEING UNSULFONATABLE, NONAROMATIC AND OF SUCH NATURE AS A DISTILL OVER WITH THE AROMATIC HYDROCARBON, COMPRISING TREATING THE SAID MIXTURE WITH ANHYDROUS ALUMINUM CHLORIDE AND ALPHA PICOLINE, AT A TEMPERATURE AND PRESSURE BELOW THE BOILING POINT OF THE AROMATIC HYDROCARBON, UNTIL THE PERCENTAGE OF SAID "PARAFFIN" HYDROCARBONS IN THE MIXTURE IS REDUCED TO ABOUT 0.2% OR LESS BY VOLUME.
Claim 2
Independent Claim
95 words
A METHOD OF REDUCING THE PERCENTAGE OF "PARAFFIN " HYDROCARBONS IN A MIXTURE OF A SMALL PERCENTAGE OF "PARAFFIN" HYDROCARBONS DISSOLVED AS NORMALLY OCCURING IMPURITIES IN A LIQUID AROMATIC HYDROCARBON PRODUCED FROM COAL, SAID "PARAFFIN" HYDROCARBONS BEING UNSULFONATABLE, NONAROMATIC AND OF SUCH NATURE AS A DISTILL OVER WITH THE AROMATIC HYDROCARBON, COMPRISING TREATING THE SAID MIXTURE WITH ANHYDROUS ALUMINUM CHLORIDE AND ALPHA PICOLINE, AT A TEMPERATURE AND PRESSURE BELOW THE BOILING POINT OF THE AROMATIC HYDROCARBON, UNTIL THE PERCENTAGE OF SAID "PARAFFIN" HYDROCARBONS IN THE MIXTURE IS REDUCED TO ABOUT 0.2% OR LESS BY VOLUME.
References Cited (Backward Citations)
US2088598A
Cited
US2458777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |