US2998413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polythioetherurethane casting and method of preparing same
Assignee: Bayer AG
•
Filing: 1955-11-16
•
Granted: 1961-08-29
•
Expires: 1975-11-16
Abstract
No abstract record available.
Inventors
- 👤 Holtschmidt Hans
- 👤 Nischk Gunther
- 👤 Kallert Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:37
CPC Classifications
C; C08; C08G; C08G79/00; C08G79/02; C07; C07C; C07C323/00; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/12; C08G18/16; C08G18/18; C08G18/1825; C08G18/28; C08G18/40; C08G18/4009; C08G18/48; C08G18/4854; C08G18/50; C08G18/5003; C08G18/5006; C08G18/5009; C08G18/52; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6681; C08G18/6688; C08G65/00; C08G65/34; C08G2110/00; C08G2110/0041; C08G2110/005; Y; Y10; Y10S; Y10S528/00; Y10S528/904; Y10S528/905; Y10S528/906; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A POLYURETHANE CASTING OBTAINED BY A PROCESS WHICH COMPRISES REACTING AN EXCESS OF AN ORGANIC POLYISOCYANATE IN A FIRST STEP WITH A POLYTHIOETHER HAVING TERMINAL HYDROXYL GROUPS AND HAVING A MILECULAR WEIGHT WITHIN THE RANGE OF FROM ABOUT 800 TO ABOUT 10,000 SAID POLYTHIOETHER HAVING BEEN FORMED BY HEATING A MONOMERIC THIOETHER GLYCOL WITH A POLYHYDRIC ALCOHOL IN THE MOLAR RATIO OF FROM ABOUT 1 TO 1.5 MOLS OF THIOETHER GLYCO PER MOL OF POLYHYDRIC ALCOHOL TO A TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 100*C. TO ABOUT 300*C., AND THEREAFTER MIXING THE RESULTING LIQUID PRODUCT WITH A POLYHYDRIC ALCOHOL CONTAINING 2 TO 3 HYDROXYL GROUPS, POURING THE RESULTING LIQUID MIXTURE INTO A MOLD, AND CURING THE LIQUID AT A TEMPERATURE OF ABOUT 110*C. FOR AT LEAST ABOUT 24 HOURS UNTIL A COMPLETELY CURED SOLID POLYURETHANE IS FORMED.
Claim 2
Dependent Claim
138 words
A POLYURETHANE CASTING OBTAINED BY A PROCESS WHICH COMPRISES REACTING AN EXCESS OF AN ORGANIC POLYISOCYANATE IN A FIRST STEP WITH A POLYTHIOETHER HAVING TERMINAL HYDROXYL GROUPS AND HAVING A MILECULAR WEIGHT WITHIN THE RANGE OF FROM ABOUT 800 TO ABOUT 10,000 SAID POLYTHIOETHER HAVING BEEN FORMED BY HEATING A MONOMERIC THIOETHER GLYCOL WITH A POLYHYDRIC ALCOHOL IN THE MOLAR RATIO OF FROM ABOUT 1 TO 1.5 MOLS OF THIOETHER GLYCO PER MOL OF POLYHYDRIC ALCOHOL TO A TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 100*C. TO ABOUT 300*C., AND THEREAFTER MIXING THE RESULTING LIQUID PRODUCT WITH A POLYHYDRIC ALCOHOL CONTAINING 2 TO 3 HYDROXYL GROUPS, POURING THE RESULTING LIQUID MIXTURE INTO A MOLD, AND CURING THE LIQUID AT A TEMPERATURE OF ABOUT 110*C. FOR AT LEAST ABOUT 24 HOURS UNTIL A COMPLETELY CURED SOLID POLYURETHANE IS FORMED.
References Cited (Backward Citations)
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US2518245A
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US2692874A
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US2726219A
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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) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |