US3395185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low molecular weight stereoregular polyoxyalkylene glycols
Assignee: Wyandotte Chemicals Corp
•
Filing: 1964-11-18
•
Granted: 1968-07-30
•
Expires: 1984-11-18
Abstract
No abstract record available.
Inventors
- 👤 Sidney L Reegen
- 👤 Kurt C Frisch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:57
CPC Classifications
C; C07; C07C; C07C43/00; C07C43/02; C07C43/03; C07C43/04; C07C43/13; C07C43/135; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4825; C08G65/00; C08G65/02; C08G65/32; C08G65/321; C08G65/324
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A METHOD FOR THE PRODUCTION OF A STEREOREGULAR POLYALKYLENE GLYCOL HAVING A MOLECULAR WEIGHT UP TO A MAXIMUM OF ABOUT 10,000, WHICH COMPRISES MIXING AND REACTING TOGETHER IN THE PRESENCE OF WTER A STEROREGULAR POLYMER, HAVING A MOLECULAR WEIGHT OF AT LEAST ABOUT 100,000, OF AN ALKYLENE OXIDE HAVING THREE TO TWELVE CARBON ATOMS, INCLUSIVE, WITH A STRONG ACID HAVING A DISSOCIATION CONSTANT OF AT LEAST ABOUT 10**-3 IN AN AMOUNT OF 0.5 TO 25 PERCENT BY WEIGHT BASED UPON THE WEIGHT OF POLYMER USED, IN AN ORGANIC SOLVENT FOR THE STARTING POLYMER AT THE REFLUX TEMPERATURE OF THE SOLVENT EMPLOYED, TO HYDROLYTICALLY CLEAVE SAID POLYMER.
Claim 2
Independent Claim
106 words
A METHOD FOR THE PRODUCTION OF A STEREOREGULAR POLYALKYLENE GLYCOL HAVING A MOLECULAR WEIGHT UP TO A MAXIMUM OF ABOUT 10,000, WHICH COMPRISES MIXING AND REACTING TOGETHER IN THE PRESENCE OF WTER A STEROREGULAR POLYMER, HAVING A MOLECULAR WEIGHT OF AT LEAST ABOUT 100,000, OF AN ALKYLENE OXIDE HAVING THREE TO TWELVE CARBON ATOMS, INCLUSIVE, WITH A STRONG ACID HAVING A DISSOCIATION CONSTANT OF AT LEAST ABOUT 10**-3 IN AN AMOUNT OF 0.5 TO 25 PERCENT BY WEIGHT BASED UPON THE WEIGHT OF POLYMER USED, IN AN ORGANIC SOLVENT FOR THE STARTING POLYMER AT THE REFLUX TEMPERATURE OF THE SOLVENT EMPLOYED, TO HYDROLYTICALLY CLEAVE SAID POLYMER.
References Cited (Backward Citations)
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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) | 1971-07-30 | 1972-01-29 | 1972-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-30 | 1976-01-29 | 1976-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-30 | 1980-01-29 | 1980-07-30 | $7700.00 | Window Closed / Lapsed |