Patent US3354266A successfully refreshed from Google Patents.
US2968672A
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Polyisocyanates containing tertiary amine structure
Assignee: Reichhold Chemicals Inc
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Filing: 1957-03-19
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Granted: 1961-01-17
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Expires: 1977-03-19
Abstract
No abstract record available.
Inventors
- 👤 Salim N Ephraim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:25
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/32; C08G18/3271; C08G18/3278; C08G18/3284; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; C08G18/8006; C08G18/8041
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A POLYISOCYANATE CONTAINING TERTIARY AMINE STRUCTURE CONSISTING ESSENTIALLY OF THE REACTION PRODUCT OF: (A) AN ORGANIC DIISOCYANATE SELECTED FROM A GROUP CONSISTING OF HEXAMETHYLENE DIISOCYANATE, TOLUYLENE DIISOCYANATE AND PHENYLENE DIISOCYANNATE, AND (B) TETRA (2 HYDROXYPROPYL) ETHYLENE DIAMINE, THE MOL RATIO OF ISOCYANATE GROUPS TO HYDROXYL GROUPS BEING WITHIN THE RANGE OF ABOUT 1.81 TO 6.264.
Claim 2
Dependent Claim
55 words
A POLYISOCYANATE CONTAINING TERTIARY AMINE STRUCTURE CONSISTING ESSENTIALLY OF THE REACTION PRODUCT OF: (A) AN ORGANIC DIISOCYANATE SELECTED FROM A GROUP CONSISTING OF HEXAMETHYLENE DIISOCYANATE, TOLUYLENE DIISOCYANATE AND PHENYLENE DIISOCYANNATE, AND (B) TETRA (2 HYDROXYPROPYL) ETHYLENE DIAMINE, THE MOL RATIO OF ISOCYANATE GROUPS TO HYDROXYL GROUPS BEING WITHIN THE RANGE OF ABOUT 1.81 TO 6.264.
References Cited (Backward Citations)
US2284896A
Cited
US2585826A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-17 | 1964-07-18 | 1965-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-17 | 1968-07-18 | 1969-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-17 | 1972-07-18 | 1973-01-17 | $7700.00 | Window Closed / Lapsed |