US3157662A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalysts for preparing carbodiimides
Assignee: EIDP Inc
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Filing: 1961-11-28
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Granted: 1964-11-17
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Expires: 1981-11-28
Abstract
No abstract record available.
Inventors
- 👤 Kenneth C Smeltz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:23
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/02; B01J31/12; B01J31/14; C; C08; C08G; C08G18/00; C08G18/02; C08G18/025; Y; Y10; Y10S; Y10S521/00; Y10S521/901
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A PROCESS FOR PREPARING ORGANIC CARBODIIMIDES WHICH COMPRISES HEATING IN THE RANGE OF FROM ABOUT 100*C. TO 250*C. UNDER ANHYDROUS CONDITIONS IN ORGANIC ISOCYANATE CONTAINING 1 TO 3 ISOCYANATE GROUPS AND SELECTED FROM THE GROUP CONSISTING OF CARBOCYCLIC AROMATIC ISOCYANATES CONTAINING FROM ONE TO THREE RINGS, SATURATED ALIPHATIC ISOCYANATES CONTAINING FROM TWO TO EIGHTEEN CARBONS IN THE ALIPHATIC GROUP, PYRIDINE ISOCYANATES AND QUINOLINE ISOCYANATES, SAID ISOCYANATE BEING FREE OF ZEREWITINOFF ACTIVE HYDROGEN, AND AN ORGANOMETALLIC CATALYST OF THE FORMULA
Claim 2
Dependent Claim
79 words
A PROCESS FOR PREPARING ORGANIC CARBODIIMIDES WHICH COMPRISES HEATING IN THE RANGE OF FROM ABOUT 100*C. TO 250*C. UNDER ANHYDROUS CONDITIONS IN ORGANIC ISOCYANATE CONTAINING 1 TO 3 ISOCYANATE GROUPS AND SELECTED FROM THE GROUP CONSISTING OF CARBOCYCLIC AROMATIC ISOCYANATES CONTAINING FROM ONE TO THREE RINGS, SATURATED ALIPHATIC ISOCYANATES CONTAINING FROM TWO TO EIGHTEEN CARBONS IN THE ALIPHATIC GROUP, PYRIDINE ISOCYANATES AND QUINOLINE ISOCYANATES, SAID ISOCYANATE BEING FREE OF ZEREWITINOFF ACTIVE HYDROGEN, AND AN ORGANOMETALLIC CATALYST 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) | 1967-11-17 | 1968-05-18 | 1968-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-17 | 1972-05-18 | 1972-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-17 | 1976-05-18 | 1976-11-17 | $7700.00 | Window Closed / Lapsed |