Patent US2914588A successfully refreshed from Google Patents.
US2914588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of isoprene
Assignee: Sunoco Inc
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Filing: 1957-03-11
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Granted: 1959-11-24
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Expires: 1977-03-11
Abstract
No abstract record available.
Inventors
- 👤 James F Dempsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:57
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/32; C07C5/327; C07C5/333; Y; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/901
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A PROCESS FOR THE PRODUCTION OF ISOPRENE WHICH INCLUDING PASSING A FEED STOCK COMPRISINGG ISOPENTANE AND FROM ABOUT 20% TO ABOUT 30% PIPERYLENE TO A DEHYDROGENATION ZONE, CONTACTING IT THEREIN WITH A DEHYDROGENATION CATALSYT AT A TEMPERATURE OF FROM ABOUT 900* F. TO ABOUT 1200* F., RECOVERING A REACTION PROUCT, SEPARATING THE REACTION PRODUCT INTO ISOPRENE, OTHER FIVE CARBON HYDROCARBONS INCLUDING PIPERYLENE, AND LOWER BOILING MATERALS AND RECYCLING ALL THE FIVE CARBON HYDROCARBONS, WITH THE EXCEPTION OF ISOPRENE, TO THE DEHYDROGENATION ZONE IN ADMIXTURE WITH FRESH ISOPENTANE IN AN AMOUNT SUFFICIENT TO REPLACE THAT COVERTED IN THE DEHYDROGENEATION ZONE.
Claim 2
Dependent Claim
99 words
A PROCESS FOR THE PRODUCTION OF ISOPRENE WHICH INCLUDING PASSING A FEED STOCK COMPRISINGG ISOPENTANE AND FROM ABOUT 20% TO ABOUT 30% PIPERYLENE TO A DEHYDROGENATION ZONE, CONTACTING IT THEREIN WITH A DEHYDROGENATION CATALSYT AT A TEMPERATURE OF FROM ABOUT 900* F. TO ABOUT 1200* F., RECOVERING A REACTION PROUCT, SEPARATING THE REACTION PRODUCT INTO ISOPRENE, OTHER FIVE CARBON HYDROCARBONS INCLUDING PIPERYLENE, AND LOWER BOILING MATERALS AND RECYCLING ALL THE FIVE CARBON HYDROCARBONS, WITH THE EXCEPTION OF ISOPRENE, TO THE DEHYDROGENATION ZONE IN ADMIXTURE WITH FRESH ISOPENTANE IN AN AMOUNT SUFFICIENT TO REPLACE THAT COVERTED IN THE DEHYDROGENEATION ZONE.
References Cited (Backward Citations)
US2401973A
Cited
US2831042A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-23 | 1963-05-25 | 1963-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-23 | 1967-05-25 | 1967-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-23 | 1971-05-25 | 1971-11-24 | $7700.00 | Window Closed / Lapsed |