US2897181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polyurethanes
Assignee: Bayer AG
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Filing: 1954-10-06
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Granted: 1959-07-28
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Expires: 1974-10-06
Abstract
No abstract record available.
Inventors
- 👤 Windemuth Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:37
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4236; C08G18/4238; C08G18/08; C08G18/089; C08G18/16; C08G18/161; C08G18/22; C08G18/222; C08G18/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A PROCESS FOR THE PREPARATION OF A HIGH MOLECULAR WEIGHT LINEAR NON-POROUS POLYURETHANE WHICH COMPRISES REACTING A HYDROXYL-TERMINATED POLYESTER PREPARED BY THE ESTERIFICATION OF ADIPIC ACID WITH A SUBSTANTIAL EXCESS OF ETHYLENE GLYCOL WITH AN ORGANIC DIISOCYANATE IN AN ACID REACTION MEDIUM AND IN THE PRESENCE OF A HEAVY METAL COMPOUND SELECTED FROM THE GROUP CONSISTING OF FERRIC CHLORIDE, FERRIC ACETYL ACETONATE, IRON PENTACARBONYL, IRON ACETOACETIC ESTER, IRON CYCLOPENTANONE CARBOXYLIC ACID ESTER AND THE CORRESPONDING COMPOUNDS OF NICKEL, COBALT, ZINC, LEAD, ALUMINUM, MANGANESE, AND MAGNESIUM, THE ACIDITY OF THE REACTION MEDIUM BEING PROVIDED BY A SUBSTANTIAL AMOUNT, UP TO ABOUT 1% BY WEIGHT BASED ON THE POLYESTER, OF TEREPHTHALIC ACID CHLORIDE.
Claim 2
Dependent Claim
111 words
A PROCESS FOR THE PREPARATION OF A HIGH MOLECULAR WEIGHT LINEAR NON-POROUS POLYURETHANE WHICH COMPRISES REACTING A HYDROXYL-TERMINATED POLYESTER PREPARED BY THE ESTERIFICATION OF ADIPIC ACID WITH A SUBSTANTIAL EXCESS OF ETHYLENE GLYCOL WITH AN ORGANIC DIISOCYANATE IN AN ACID REACTION MEDIUM AND IN THE PRESENCE OF A HEAVY METAL COMPOUND SELECTED FROM THE GROUP CONSISTING OF FERRIC CHLORIDE, FERRIC ACETYL ACETONATE, IRON PENTACARBONYL, IRON ACETOACETIC ESTER, IRON CYCLOPENTANONE CARBOXYLIC ACID ESTER AND THE CORRESPONDING COMPOUNDS OF NICKEL, COBALT, ZINC, LEAD, ALUMINUM, MANGANESE, AND MAGNESIUM, THE ACIDITY OF THE REACTION MEDIUM BEING PROVIDED BY A SUBSTANTIAL AMOUNT, UP TO ABOUT 1% BY WEIGHT BASED ON THE POLYESTER, OF TEREPHTHALIC ACID CHLORIDE.
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) | 1962-07-27 | 1963-01-26 | 1963-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-27 | 1967-01-26 | 1967-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-27 | 1971-01-26 | 1971-07-28 | $7700.00 | Window Closed / Lapsed |