US2720508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyureidopolyamides
Assignee: Rohm and Haas Co
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Filing: 1952-11-28
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Granted: 1955-10-11
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Expires: 1972-11-28
Abstract
No abstract record available.
Inventors
- 👤 Melamed Sidney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:15
CPC Classifications
C; C08; C08G; C08G69/00; C08L; C08L75/00; C08L75/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A METHOD FOR PREPARING WATER-SOLUBLE POLYUREIDO POLYAMIDES WHICH COMPRISES REACTING TOGETHER BETWEEN 150* AND 250* C. UNTIL A WATER-SOLUBLE CONDENSATE IS FORMED EPSILON-CAPROLACTAM AND AN ALKYLENE POLYAMINE HAVING AN ALKYLENE GROUP OF TWO TO THREE CARBON ATOMS, THE MOLE RATIO IN THE REACTING MIXTURE OF SAID CAPROLACTAM TO SAID POLYAMINE BEING FROM 1:1 TO 3:1, AND REACTING SAID SOLUBLE CONDENSATES AND UREA BY HEATING THEM TOGETHER BETWEEN 100* AND 200* C. WITH EVOLUTION OF AMMONIA.
Claim 2
Independent Claim
75 words
A METHOD FOR PREPARING WATER-SOLUBLE POLYUREIDO POLYAMIDES WHICH COMPRISES REACTING TOGETHER BETWEEN 150* AND 250* C. UNTIL A WATER-SOLUBLE CONDENSATE IS FORMED EPSILON-CAPROLACTAM AND AN ALKYLENE POLYAMINE HAVING AN ALKYLENE GROUP OF TWO TO THREE CARBON ATOMS, THE MOLE RATIO IN THE REACTING MIXTURE OF SAID CAPROLACTAM TO SAID POLYAMINE BEING FROM 1:1 TO 3:1, AND REACTING SAID SOLUBLE CONDENSATES AND UREA BY HEATING THEM TOGETHER BETWEEN 100* AND 200* C. WITH EVOLUTION OF AMMONIA.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-10 | 1959-04-11 | 1959-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-10 | 1963-04-11 | 1963-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-10 | 1967-04-11 | 1967-10-11 | $7700.00 | Window Closed / Lapsed |