Patent US3294856A successfully refreshed from Google Patents.
US3294856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation and purification of styrene
Assignee: Halcon Research and Development Corp
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Filing: 1964-02-04
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Granted: 1966-12-27
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Expires: 1984-02-04
Abstract
No abstract record available.
Inventors
- 👤 Jr Harold A Huckins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:09
CPC Classifications
C; C07; C07C; C07C15/00; C07C15/40; C07C15/42; C07C15/44; C07C15/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
IN A PROCESS FOR THE PRODUCTION OF STYRENE BY THE DEHYDROGENATION OF ETHYL BENZENE IN THE PRESENCE OF STEAM WHEREIN THE REACTTOR EFFLUENT CONTAINS STEAM AND ORGANIC MATERIAL INCLUDING STYRENE, AND WHEREIN THE STYRENE IS SEPARATED FROM THE REACTOR EFFLUENT BY DISTILLATION, THE IMPROVEMENT WHICH COMPRISES: INDIRECTLY CONTACTING AT LEAST PORTION OF THE GASEOUS REACTOR EFFLUENT WITH A LIQUID STREAM FROM SAID DISTILLATION SO AS TO CONDENSE THE STEAM, BUT NOT A SUBSTANTIAL AMOUNT OF SAID ORGANIC MATERIAL, IN SAID REACTOR EFFLUENT, THEREBY PROVIDING DISTILLATION HEAT FOR SAID DISTILLATION.
Claim 2
Dependent Claim
89 words
IN A PROCESS FOR THE PRODUCTION OF STYRENE BY THE DEHYDROGENATION OF ETHYL BENZENE IN THE PRESENCE OF STEAM WHEREIN THE REACTTOR EFFLUENT CONTAINS STEAM AND ORGANIC MATERIAL INCLUDING STYRENE, AND WHEREIN THE STYRENE IS SEPARATED FROM THE REACTOR EFFLUENT BY DISTILLATION, THE IMPROVEMENT WHICH COMPRISES: INDIRECTLY CONTACTING AT LEAST PORTION OF THE GASEOUS REACTOR EFFLUENT WITH A LIQUID STREAM FROM SAID DISTILLATION SO AS TO CONDENSE THE STEAM, BUT NOT A SUBSTANTIAL AMOUNT OF SAID ORGANIC MATERIAL, IN SAID REACTOR EFFLUENT, THEREBY PROVIDING DISTILLATION HEAT FOR SAID DISTILLATION.
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) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |