Patent US2857435A successfully refreshed from Google Patents.
US2857435A
Expired / Lapsed
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Recovery of monoalkyl ethers of diethylene glycol from solutions
Assignee: EIDP Inc
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Filing: 1958-02-10
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Granted: 1958-10-21
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Expires: 1978-02-10
Abstract
No abstract record available.
Inventors
- 👤 Alfred A Gonzalez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:54
CPC Classifications
C; C07; C07C; C07C43/00; C07C43/02; C07C43/03; C07C43/04; C07C43/13; C07C43/135
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
THE PROCESS FOR RECOVERING MONOALKYL ETHERS OF DIETHYLENE GLYCOL FROM SOLUTIONS THEREIN OF TARRY ACETYLENE POLYMERS FORMED IN THE MANUFACTURE OF MONOVINYLACETYLENE, SAID PROCESS COMPRISING THE STEPS OF MIXING THE SOLUTION OF THE TAR IN THE MONOALKYL ETHER WITH DILUTE HYDROCHLORIC ACID AND A LIQUID AROMATIC HYDROCARBON SOLVENT WHICH IS PREDOMINTNALY AROMATIC, SEPARATING THE MIXTURE INTO A LIGHTER LAYER COMPRISING TAR AND SOLVENT AND A HEAVIER LAYER COMPRISING THE MONOALKYL ETHER AND THE DILUTE HYDROCHLORIC ACID, FOLLOWED BY SEPARATING AND RECYCLING SAID MONOALKYL ETHER LAYER FOR THE MANUFACTURE OF ADDITIONAL MONOVINYLACETYLENE.
Claim 2
Dependent Claim
91 words
THE PROCESS FOR RECOVERING MONOALKYL ETHERS OF DIETHYLENE GLYCOL FROM SOLUTIONS THEREIN OF TARRY ACETYLENE POLYMERS FORMED IN THE MANUFACTURE OF MONOVINYLACETYLENE, SAID PROCESS COMPRISING THE STEPS OF MIXING THE SOLUTION OF THE TAR IN THE MONOALKYL ETHER WITH DILUTE HYDROCHLORIC ACID AND A LIQUID AROMATIC HYDROCARBON SOLVENT WHICH IS PREDOMINTNALY AROMATIC, SEPARATING THE MIXTURE INTO A LIGHTER LAYER COMPRISING TAR AND SOLVENT AND A HEAVIER LAYER COMPRISING THE MONOALKYL ETHER AND THE DILUTE HYDROCHLORIC ACID, FOLLOWED BY SEPARATING AND RECYCLING SAID MONOALKYL ETHER LAYER FOR THE MANUFACTURE OF ADDITIONAL MONOVINYLACETYLENE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |