US3285879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Curing of isocyanate-terminated polyurethane polymers with n-monoalkyl-aromatic diamines
Assignee: Universal Oil Products Co
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Filing: 1963-01-31
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Granted: 1966-11-15
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Expires: 1983-01-31
Abstract
No abstract record available.
Inventors
- 👤 John R Larson
- 👤 Charles M Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:23
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; Y; Y10; Y10S; Y10S528/00; Y10S528/903; Y10S528/906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A METHOD OF CURING AN ISOCYANATE-TERMINATED POLYURETHANE PREPOLYMER FORMED BY THE REACTION OF A POLYISOCYANATE WITH A POLYALKYLENEETHER GLYCOL, WHICH COMPRISES MIXING WITH SAID PREPOLYMER A CURING AGENT CONSISTING ESSENTIALLY OF AN N-MONOALKYLL-AROMATIC DIAMINE IN AN AMOUNT SUFFICIENT TO REACT WITH AT LAST 75% OF THE ISOCYANATE GROUPS OF THE PREPOLYMER, THE ALKYL SUBSTITUTION BEING ON ONLY ONE OF THE AMINE GROUPS OF SAID DIAMINE AND HEATING THE RESULTANT MIXTURE TO A TEMPRATURE OF AT LEAST ABOUT 100*C. FOR A PERIOD OF AT LEAST ONE HOUR TO PRODUCE AN ELASTOMER,
Claim 2
Independent Claim
90 words
A METHOD OF CURING AN ISOCYANATE-TERMINATED POLYURETHANE PREPOLYMER FORMED BY THE REACTION OF A POLYISOCYANATE WITH A POLYALKYLENEETHER GLYCOL, WHICH COMPRISES MIXING WITH SAID PREPOLYMER A CURING AGENT CONSISTING ESSENTIALLY OF AN N-MONOALKYLL-AROMATIC DIAMINE IN AN AMOUNT SUFFICIENT TO REACT WITH AT LAST 75% OF THE ISOCYANATE GROUPS OF THE PREPOLYMER, THE ALKYL SUBSTITUTION BEING ON ONLY ONE OF THE AMINE GROUPS OF SAID DIAMINE AND HEATING THE RESULTANT MIXTURE TO A TEMPRATURE OF AT LEAST ABOUT 100*C. FOR A PERIOD OF AT LEAST ONE HOUR TO PRODUCE AN ELASTOMER,
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) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |