Patent US2924581A successfully refreshed from Google Patents.
US2924581A
Expired / Lapsed
US
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Cellular polyurethane resins and preparation of same
Assignee: Pfizer Inc
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Filing: 1957-10-01
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Granted: 1960-02-09
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Expires: 1977-10-01
Abstract
No abstract record available.
Inventors
- 👤 Bavley Abraham
- 👤 Charles J Knuth
- 👤 Albert E Timreck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:54
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/68; C08G2110/00; C08G2110/0083
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
POLYURETHANE FOAM COMPOSITIONS HAVING IMPROVED COLOR STABILITY, IMPROVED RESISTANCE TO DEGRADATION UPON EXPOSURE TO HIGH HUMIDITY AND IMPROVED COMPRESSION-DEFLECTION BEHAVIOR, COMPRISING THE REACTION PRODUCT OF: (A) A POLYESTER FORMED BY SUBSTANTIALLY COMPLETE ESTERIFICATION OF ITACONIC ACID, AT LEAST ONE SATURATED DICARBOXYLIC ACID OF FROM ABOUT FOUR TO TEN CARBON ATOMS AND A SLIGHT EXCESS OF AT LEAST ONE GLYCOL, SAID ITACONIC ACID AND DICARBOXYLIC ACID BEING PRESENT IN A RATIO OF FROM ABOUT 5 TO 50 MOL, PERCENT TO ABOUT 50 TO 95 MOL. PERCENT, BASED ON TOTAL DICARBOXYLIC ACID PRESENT, (B) AN ORGANIC DIISOCYANATE, IN AN EXCESS OF ABOUT TWO TO ABOUT FOUR EQUIVALENTS OVER THAT REQUIRED TO REACT WITH SAID POLYESTER, AND (C) WATER IN PROPORTION OF FROM ABOUT ONE TO ABOUT TWO EQUIVALENTS PER EQUIVALENT OF EXCESS DIISOCYANATE.
Claim 2
Dependent Claim
131 words
POLYURETHANE FOAM COMPOSITIONS HAVING IMPROVED COLOR STABILITY, IMPROVED RESISTANCE TO DEGRADATION UPON EXPOSURE TO HIGH HUMIDITY AND IMPROVED COMPRESSION-DEFLECTION BEHAVIOR, COMPRISING THE REACTION PRODUCT OF: (A) A POLYESTER FORMED BY SUBSTANTIALLY COMPLETE ESTERIFICATION OF ITACONIC ACID, AT LEAST ONE SATURATED DICARBOXYLIC ACID OF FROM ABOUT FOUR TO TEN CARBON ATOMS AND A SLIGHT EXCESS OF AT LEAST ONE GLYCOL, SAID ITACONIC ACID AND DICARBOXYLIC ACID BEING PRESENT IN A RATIO OF FROM ABOUT 5 TO 50 MOL, PERCENT TO ABOUT 50 TO 95 MOL. PERCENT, BASED ON TOTAL DICARBOXYLIC ACID PRESENT, (B) AN ORGANIC DIISOCYANATE, IN AN EXCESS OF ABOUT TWO TO ABOUT FOUR EQUIVALENTS OVER THAT REQUIRED TO REACT WITH SAID POLYESTER, AND (C) WATER IN PROPORTION OF FROM ABOUT ONE TO ABOUT TWO EQUIVALENTS PER EQUIVALENT OF EXCESS DIISOCYANATE.
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) | 1963-02-08 | 1963-08-10 | 1964-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-08 | 1967-08-10 | 1968-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-08 | 1971-08-10 | 1972-02-09 | $7700.00 | Window Closed / Lapsed |