US2782240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ethers of polyoxyalkylene glycols
Assignee: Dow Chemical Co
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Filing: 1952-11-21
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Granted: 1957-02-19
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Expires: 1972-11-21
Abstract
No abstract record available.
Inventors
- 👤 Robert E Hefner
- 👤 Malcolm E Pruitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:08
CPC Classifications
C; C07; C07C; C07C41/00; C07C41/01; C07C41/02; C07C41/03; C08; C08G; C08G65/00; C08G65/02; C08G65/26; C08G65/2639
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
THE PROCESS FOR SEPARATING ALKALI METAL SALTS OF MONOETHERS OF POLYOXYALKYLENE GLYCOLS WHICH CONSISTS ESSENTIALLY OF REACTING AT LEAST ONE COMPOUND OF THE CLASS CONSISTING OF THE 1,2-EPOXIDES OF ETHYLENE, PROPYLENE, AND BUTYLENE WITH THE ALKALI METAL SALT OF A MONOHYDROXY COMPOUND OF THE CLASS CONSISTING OF ALIPHATIC ALCOHOLS AND PHENOLS HAVING FROM 1 TO 20 CARBON ATOMS AND CONTAINING ONLY CARBON, HYDROGEN, AND OXGYEN IN THE MOLECULE, WITH NO FUNCTIONAL GROUP OTHER THAN THE HYDROXY GROUP ATTACHED THERETO, SAID REACTION BEING CARRIED OUT UNDER RELATIVELY MOISTURE-FREE CONDITIONS IN THE TEMPERATURE RANGE OF 60* TO 200*C. BY ADDING THE 1,2-EPOXY COMPOUND TO A WELL-AGITATED SOLUTION OF THE ALKALI METAL SALT OF THE MONOHYDROXY COMPOUND IN A DILUENT WHICH IS RELATIVELY INERT TO BOTH THE ALKALI METAL AND THE 1,2EPOXY COMPOUND UNTIL AT LEAST 5 MOLES OF 1,2-EPOXY COMPOUND HAVE BEEN ADDED FOR EACH MOLE OF THE ALKALI METAL SALT OF THE MONOHYDROXY COMPOUND.
Claim 2
Dependent Claim
153 words
THE PROCESS FOR SEPARATING ALKALI METAL SALTS OF MONOETHERS OF POLYOXYALKYLENE GLYCOLS WHICH CONSISTS ESSENTIALLY OF REACTING AT LEAST ONE COMPOUND OF THE CLASS CONSISTING OF THE 1,2-EPOXIDES OF ETHYLENE, PROPYLENE, AND BUTYLENE WITH THE ALKALI METAL SALT OF A MONOHYDROXY COMPOUND OF THE CLASS CONSISTING OF ALIPHATIC ALCOHOLS AND PHENOLS HAVING FROM 1 TO 20 CARBON ATOMS AND CONTAINING ONLY CARBON, HYDROGEN, AND OXGYEN IN THE MOLECULE, WITH NO FUNCTIONAL GROUP OTHER THAN THE HYDROXY GROUP ATTACHED THERETO, SAID REACTION BEING CARRIED OUT UNDER RELATIVELY MOISTURE-FREE CONDITIONS IN THE TEMPERATURE RANGE OF 60* TO 200*C. BY ADDING THE 1,2-EPOXY COMPOUND TO A WELL-AGITATED SOLUTION OF THE ALKALI METAL SALT OF THE MONOHYDROXY COMPOUND IN A DILUENT WHICH IS RELATIVELY INERT TO BOTH THE ALKALI METAL AND THE 1,2EPOXY COMPOUND UNTIL AT LEAST 5 MOLES OF 1,2-EPOXY COMPOUND HAVE BEEN ADDED FOR EACH MOLE OF THE ALKALI METAL SALT OF THE MONOHYDROXY COMPOUND.
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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) | 1960-02-19 | 1960-08-20 | 1961-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-19 | 1964-08-20 | 1965-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-19 | 1968-08-20 | 1969-02-19 | $7700.00 | Window Closed / Lapsed |