Patent US2494335A successfully refreshed from Google Patents.
US2494335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing high purity normal heptane
Assignee: Standard Oil Development Co
•
Filing: 1947-09-29
•
Granted: 1950-01-10
•
Expires: 1967-09-29
Abstract
No abstract record available.
Inventors
- 👤 Keith J F Dutson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:08
CPC Classifications
C; C07; C07C; C07C15/00; Y; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/901; Y10S585/905; Y10S585/949; Y10S585/954
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
181 words
A PROCESS FOR PREPARING SUBSTANTIALLY PURE NORMAL HEPTANE FROM A NAPHTHA CONTAINING NORMAL HEPTANE IN ADMIXTURE WITH HYDROCARBONS HAVING SIMILAR BOILING POINTS INCLUDING METHYLCYCLOHEXANE WHICH INCLUDES THE STEPS OF CONTACTING THE SAID NAPHTHA IN THE PRESENCE OF HYDROGEN WITH A CATALYST CAPABLE OF DEHYDROGENATING METHYLCYCLOHEXANE AT A TEMPERATURE IN THE RANGE BETWEEN 900* AND 950*F AND AT A PRESSURE IN THE RANGE BETWEEN 180 AND 250 POUNDS PER SQUARE INCH UNDER CONDITIONS FAVORABLE TO THE DEHYDROGENATION OF METHYLCYCLOHEXANE AND REMOVING A PRODUCTION FROM THE REACTION ZONE, CONTACTING AT LEAST A PORTION OF SAID PRODUCT IN THE PRESENCE OF HYDROGEN WITH A CATALYST CAPABLE OF DEHYDROGENATING METHYLCYCLOHEXANE AT A TEMPERATURE IN THE RANGE BETWEEN 900* AND 950*F. AND AT A PRESSURE IN THE RANGE BETWEEN 180 AND 250 POUNDS PER SQUARE INCH UNDER CONDITIONS FAVORABLE TO THE DEHYDROGENATION OF METHYLCYCLOHEXANE AND RECOVERING A PRODUCT FROM SAID LATTER CONTACTING STEP, ACID TREATING THE SAID LAST MENTIONED PRODUCT WITH SULFURIC ACID AND REDISTILLING THE ACID TREATED PRODUCT TO RECOVER A HYDROCARBON FRACTION BOILING BETWEEN ABOUT 208*F. AND 211*F. CONSISTING OF SUBSTANTIALLY PURE NORMAL HEPTANE.
Claim 2
Dependent Claim
181 words
A PROCESS FOR PREPARING SUBSTANTIALLY PURE NORMAL HEPTANE FROM A NAPHTHA CONTAINING NORMAL HEPTANE IN ADMIXTURE WITH HYDROCARBONS HAVING SIMILAR BOILING POINTS INCLUDING METHYLCYCLOHEXANE WHICH INCLUDES THE STEPS OF CONTACTING THE SAID NAPHTHA IN THE PRESENCE OF HYDROGEN WITH A CATALYST CAPABLE OF DEHYDROGENATING METHYLCYCLOHEXANE AT A TEMPERATURE IN THE RANGE BETWEEN 900* AND 950*F AND AT A PRESSURE IN THE RANGE BETWEEN 180 AND 250 POUNDS PER SQUARE INCH UNDER CONDITIONS FAVORABLE TO THE DEHYDROGENATION OF METHYLCYCLOHEXANE AND REMOVING A PRODUCTION FROM THE REACTION ZONE, CONTACTING AT LEAST A PORTION OF SAID PRODUCT IN THE PRESENCE OF HYDROGEN WITH A CATALYST CAPABLE OF DEHYDROGENATING METHYLCYCLOHEXANE AT A TEMPERATURE IN THE RANGE BETWEEN 900* AND 950*F. AND AT A PRESSURE IN THE RANGE BETWEEN 180 AND 250 POUNDS PER SQUARE INCH UNDER CONDITIONS FAVORABLE TO THE DEHYDROGENATION OF METHYLCYCLOHEXANE AND RECOVERING A PRODUCT FROM SAID LATTER CONTACTING STEP, ACID TREATING THE SAID LAST MENTIONED PRODUCT WITH SULFURIC ACID AND REDISTILLING THE ACID TREATED PRODUCT TO RECOVER A HYDROCARBON FRACTION BOILING BETWEEN ABOUT 208*F. AND 211*F. CONSISTING OF SUBSTANTIALLY PURE NORMAL HEPTANE.
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) | 1953-01-09 | 1953-07-11 | 1954-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-09 | 1957-07-11 | 1958-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-09 | 1961-07-11 | 1962-01-10 | $7700.00 | Window Closed / Lapsed |