Patent US3356738A successfully refreshed from Google Patents.
US3356738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of water-insoluble hydroxyl-containing polyethers
Assignee: Witco Corp
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Filing: 1963-12-11
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Granted: 1967-12-05
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Expires: 1983-12-11
Abstract
No abstract record available.
Inventors
- 👤 Henry W Hauser
- 👤 Kurt L Schoenrade
- 👤 Scott J Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:41
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
IN A METHOD OF REMOVING WATER-SOLUBLE IMPURITIES FROM WATER-INSOLUBLE HYDROXYL-CONTAINING POLYETHERS, THE STEPS WHICH COMPRISE PROVIDING A MIXTURE OF WATER WITH A NORMALLY LIQUID ESSENTIALLY WATER-INSOLUBLE HYDROXYLTERMINATED POLYETHER POLYOL HAVING A MOLECULAR WEIGHT IN THE RANGE OF 600 TO 7,000 AND CONSISTING OF CARBON, HYDROGEN, AND OXYGEN AT AN ELEVATED TEMPERATURE, BELOW THE BOILING POINT OF WATER AT THE PRESSURE INVOLVED, AT WHICH THERE IS A DIFFERENCE IN DENSITY BETWEEN THE WATER AND THE POLYETHER SUFFICIENT TO PERMIT CENTRIFUGAL SEPA-
Claim 2
Dependent Claim
80 words
IN A METHOD OF REMOVING WATER-SOLUBLE IMPURITIES FROM WATER-INSOLUBLE HYDROXYL-CONTAINING POLYETHERS, THE STEPS WHICH COMPRISE PROVIDING A MIXTURE OF WATER WITH A NORMALLY LIQUID ESSENTIALLY WATER-INSOLUBLE HYDROXYLTERMINATED POLYETHER POLYOL HAVING A MOLECULAR WEIGHT IN THE RANGE OF 600 TO 7,000 AND CONSISTING OF CARBON, HYDROGEN, AND OXYGEN AT AN ELEVATED TEMPERATURE, BELOW THE BOILING POINT OF WATER AT THE PRESSURE INVOLVED, AT WHICH THERE IS A DIFFERENCE IN DENSITY BETWEEN THE WATER AND THE POLYETHER SUFFICIENT TO PERMIT CENTRIFUGAL SEPA-
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) | 1970-12-04 | 1971-06-05 | 1971-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-04 | 1975-06-05 | 1975-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-04 | 1979-06-05 | 1979-12-05 | $7700.00 | Window Closed / Lapsed |