Patent US2818404A successfully refreshed from Google Patents.
US2818404A
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US
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Curing of polyurethanes with a di(isocyanatoaryl) urea
Assignee: EIDP Inc
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Filing: 1954-06-07
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Granted: 1957-12-31
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Expires: 1974-06-07
Abstract
No abstract record available.
Inventors
- 👤 Jr Frederick B Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:18
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/7806; C08G18/7818; C08G18/7825; C08G18/08; C08G18/10; Y; Y10; Y10S; Y10S528/00; Y10S528/906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
IN A PROCESS OF MAKING CURED POLYURETHANE ELASTOMERS, THE STEPS WHICH COMPRISE MIXING (A) 100 PARTS BY WEIGHT OF AN ISOCYANATE-CURABLE, UNCURED POLYURETHANE ELASTOMERIC REACTION PRODUCT CONTAINING SUBSTANTIALLY NO FREE ISOCYANATE GROUPS AND CONTAINING A PLURALITY OF INTRALINEAR GROUPS HAVING FORMULA WEIGHTS OF AT LEAST 732 AND SELECTED FROM THE CLASS CONSISTING OF POLYOXYALKYLENE AND POLYESTER GROUPS SAID REACTION PRODUCT CONTAINING A PLURALITY OF URETHANE LINKAGES OF THE FORMULA,
Claim 2
Dependent Claim
69 words
IN A PROCESS OF MAKING CURED POLYURETHANE ELASTOMERS, THE STEPS WHICH COMPRISE MIXING (A) 100 PARTS BY WEIGHT OF AN ISOCYANATE-CURABLE, UNCURED POLYURETHANE ELASTOMERIC REACTION PRODUCT CONTAINING SUBSTANTIALLY NO FREE ISOCYANATE GROUPS AND CONTAINING A PLURALITY OF INTRALINEAR GROUPS HAVING FORMULA WEIGHTS OF AT LEAST 732 AND SELECTED FROM THE CLASS CONSISTING OF POLYOXYALKYLENE AND POLYESTER GROUPS SAID REACTION PRODUCT CONTAINING A PLURALITY OF URETHANE LINKAGES OF THE FORMULA,
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) | 1960-12-30 | 1961-07-01 | 1961-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-30 | 1965-07-01 | 1965-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-30 | 1969-07-01 | 1969-12-31 | $7700.00 | Window Closed / Lapsed |