US3703520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adducts of ethylene carbonate and triethylenediamine
Assignee: Pharmacia and Upjohn Co
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Filing: 1970-10-06
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Granted: 1972-11-21
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Expires: 1990-10-06
Abstract
Abstract NOVEL CATALYTIC COMPOSITIONS ARE DISCLOSED WHICH ARE THE MONOHYDRATE AND UNHYDRATED ADDUCTS RESPECTIVELY OF SUBSTANTIALLY EQUIMOLAR PROPORTIONS OF ETHYLENE CARBONATE AND TRIETHYLENEDIAMINE. THE ADDUCTS ARE USEFUL ORGANIC ISOCYANATE TRIMERIZATION CATALYSTS.
Inventors
- 👤 Peter S Carleton
- 👤 William J Farrissey Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:32
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/02; C07D487/08; B; B01; B01J; B01J31/00; B01J31/02; B01J31/0234; B01J31/0235; B01J31/0237; C07D317/00; C07D317/08; C07D317/10; C07D317/32; C07D317/34; C07D317/36; C07D317/38; C08; C08G; C08G18/00; C08G18/02; C08G18/022; B01J2231/00; B01J2231/20
Claims Analysis
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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) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |