US3341599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of polyethers
Assignee: Bayer AG
•
Filing: 1964-07-01
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Granted: 1967-09-12
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Expires: 1984-07-01
Abstract
No abstract record available.
Inventors
- 👤 Bormann Heinrich
- 👤 Nordt Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:44
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A METHOD OF PURIFYING A POLYHYDRIC POLYOXYALKYLENE ETHER PREPARED BY THE REACTION OF A COMPOUND CONTAINING ACTIVE HYDROGEN SELECTED FROM THE GROUP CONSISTING OF POLYHYDRIC ALCOHOLS, AMINES, PHENOLS, AND WATER, WITH AN ALKYLENE OXIDE IN THE PRESENCE OF AN ALKALIMETAL HYDROXIDE, WHICH COMPRISES NEUTRALIZING THE ALKALI METAL HYDROXIDE WITH AN AQUEOUS SOLUTION OF A MINERAL ACID TO PREPARE AN EMULSION CONTAINING POLYETHER AND MINERAL ACID SALT, REMOVING WATER FROM SAID EMULSION UNTIL A RESIDUAL WATER CONTENT OF ROM ABOUT0.5 TO ABOUT 3% BY WEIGHT BASED ON THE TOTAL WEIGHT OF THE EMULSION IS FORMED, MECHANICALLY REMOVING THE MINERAL ACID SALTS PRECIPITATED THEREBY AND FINALLY REMOVING SUBSTANTIALLY THE BALANCE OF THE WATER.
Claim 2
Independent Claim
111 words
A METHOD OF PURIFYING A POLYHYDRIC POLYOXYALKYLENE ETHER PREPARED BY THE REACTION OF A COMPOUND CONTAINING ACTIVE HYDROGEN SELECTED FROM THE GROUP CONSISTING OF POLYHYDRIC ALCOHOLS, AMINES, PHENOLS, AND WATER, WITH AN ALKYLENE OXIDE IN THE PRESENCE OF AN ALKALIMETAL HYDROXIDE, WHICH COMPRISES NEUTRALIZING THE ALKALI METAL HYDROXIDE WITH AN AQUEOUS SOLUTION OF A MINERAL ACID TO PREPARE AN EMULSION CONTAINING POLYETHER AND MINERAL ACID SALT, REMOVING WATER FROM SAID EMULSION UNTIL A RESIDUAL WATER CONTENT OF ROM ABOUT0.5 TO ABOUT 3% BY WEIGHT BASED ON THE TOTAL WEIGHT OF THE EMULSION IS FORMED, MECHANICALLY REMOVING THE MINERAL ACID SALTS PRECIPITATED THEREBY AND FINALLY REMOVING SUBSTANTIALLY THE BALANCE OF THE WATER.
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) | 1970-09-11 | 1971-03-13 | 1971-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-11 | 1975-03-13 | 1975-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-11 | 1979-03-13 | 1979-09-12 | $7700.00 | Window Closed / Lapsed |