US3188353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing polyethers
Assignee: Bayer AG
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Filing: 1961-08-29
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Granted: 1965-06-08
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Expires: 1981-08-29
Abstract
No abstract record available.
Inventors
- 👤 Holtschmidt Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:32
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
IN THE PREPARATION OF A POLYHYDRIC POLYALKYLENE ETHER BY A PROCESS WHICH COMPRISES HEATING AN ALIPHATC POLYHYDRIC ALCOHOL HAVING AT LEAST TWO PRIMARY HYDROXYL GROUPS AND HAVING AT LEAST SIX CARBON ATOMS IN THE CARBON TO CARBON CHAIN BETWEEN SAID PRIMARY HYDROXYL GROUPS, IN THE PRESENCE OF A SULFONIC ACID CATALYST TO A TEMPERATURE OF FROM ABOUT 120*C. TO ABOUT 250*C. TO FORM SAID POLYHYDRIC POLYALKYLENE ETHER, THE IMPROVEMENT WHICH COMPRISES HEATING SAID POLYHYDRIC ALCOHOL WHILE MIXED WITH A SULFONIC ACID SELECTED FROM THE GROUP CONSISTING OF NAPHTHALENE DISULFONIC ACID AND BENZENE DISULFONIC ACID.
Claim 2
Dependent Claim
94 words
IN THE PREPARATION OF A POLYHYDRIC POLYALKYLENE ETHER BY A PROCESS WHICH COMPRISES HEATING AN ALIPHATC POLYHYDRIC ALCOHOL HAVING AT LEAST TWO PRIMARY HYDROXYL GROUPS AND HAVING AT LEAST SIX CARBON ATOMS IN THE CARBON TO CARBON CHAIN BETWEEN SAID PRIMARY HYDROXYL GROUPS, IN THE PRESENCE OF A SULFONIC ACID CATALYST TO A TEMPERATURE OF FROM ABOUT 120*C. TO ABOUT 250*C. TO FORM SAID POLYHYDRIC POLYALKYLENE ETHER, THE IMPROVEMENT WHICH COMPRISES HEATING SAID POLYHYDRIC ALCOHOL WHILE MIXED WITH A SULFONIC ACID SELECTED FROM THE GROUP CONSISTING OF NAPHTHALENE DISULFONIC ACID AND BENZENE DISULFONIC ACID.
References Cited (Backward Citations)
US2492955A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-07 | 1968-12-07 | 1969-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-07 | 1972-12-07 | 1973-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-07 | 1976-12-07 | 1977-06-08 | $7700.00 | Window Closed / Lapsed |