Patent US4114770A successfully refreshed from Google Patents.
Patent US3272723A successfully refreshed from Google Patents.
US3272723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of xylenes from styrene by distillation in the presence of combined azeotroping agent and solvent additive
Assignee: Monsanto Co
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Filing: 1962-10-24
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Granted: 1966-09-13
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Expires: 1982-10-24
Abstract
No abstract record available.
Inventors
- 👤 Loyd W Fannin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:23
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/06; C07C7/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A PROCESS FOR THE SEPARATION OF AN AROMATIC HYDROCARBON MIXTURE CONTAINING VINYL AROMATIC HYDROCARBONS AND ALKYL AROMATIC HYDROCARBONS WHICH COMPRISES SUBJECTING SUCH AROMATIC HYDROCARBON MIXTURE TO DISTILLATION IN THE PRESENCE OF A SOLVENT COMPRISED OF AN ORGANIC SALT OF A METAL FROM GROUP II-B OF THE PERIODIC TABLE AND AN ACYCLIC ALIPHATIC ACID OF LESS THAN 5 CARBON ATOMS, RECOVERING FROM SAID DISTILLATION AN OVERHEAD DISTILLATE CONTAINING SAID ACYCLIC ALIPHACTIC ACID AND AN ALKYL AROMATIC HYDROCARBONS FRACTION SUBSTANTIALLY RICHER IN ALKYL AROMATIC HYDROCARBONS THAN THE ORIGINAL AROMATIC HYDROCARBON MIXTURE, AND RECOVERING A BOTTOMS CONTAINING SAID ORGANIC SALT OF A METAL FROM GROUP II-B OF THE PERIODIC TABLE AND A VINYL AROMATIC HYDROCARBON FRACTION SUBSTANTIALLY RICHER IN VINYL AROMATIC HYDROCARBONS THAN SAID ORIGINAL AROMATIC HYDROCARBON MIXTURE.
Claim 2
Dependent Claim
125 words
A PROCESS FOR THE SEPARATION OF AN AROMATIC HYDROCARBON MIXTURE CONTAINING VINYL AROMATIC HYDROCARBONS AND ALKYL AROMATIC HYDROCARBONS WHICH COMPRISES SUBJECTING SUCH AROMATIC HYDROCARBON MIXTURE TO DISTILLATION IN THE PRESENCE OF A SOLVENT COMPRISED OF AN ORGANIC SALT OF A METAL FROM GROUP II-B OF THE PERIODIC TABLE AND AN ACYCLIC ALIPHATIC ACID OF LESS THAN 5 CARBON ATOMS, RECOVERING FROM SAID DISTILLATION AN OVERHEAD DISTILLATE CONTAINING SAID ACYCLIC ALIPHACTIC ACID AND AN ALKYL AROMATIC HYDROCARBONS FRACTION SUBSTANTIALLY RICHER IN ALKYL AROMATIC HYDROCARBONS THAN THE ORIGINAL AROMATIC HYDROCARBON MIXTURE, AND RECOVERING A BOTTOMS CONTAINING SAID ORGANIC SALT OF A METAL FROM GROUP II-B OF THE PERIODIC TABLE AND A VINYL AROMATIC HYDROCARBON FRACTION SUBSTANTIALLY RICHER IN VINYL AROMATIC HYDROCARBONS THAN SAID ORIGINAL AROMATIC HYDROCARBON MIXTURE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |