Patent US3728291A successfully refreshed from Google Patents.
US3728291A
Expired / Lapsed
US
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Catalyst composition for polyurethane foam
Assignee: Air Products and Chemicals Inc
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Filing: 1971-06-21
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Granted: 1973-04-17
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Expires: 1991-06-21
Abstract
Abstract IN PREPARING POLYURETHANE FOAMS, TRIETHYLENEDIAMINE DIFORMATE SALT IS EMPLOYED IN COMBINATION WITH AN AMOUNT OF HPI (1-(2-HYDROXYPHROPYL) IMIDAZOLE) NOT GREATER THAN THE AMOUNT OF THE SALT. SUCH AMINE CATALYST COMPOSITIONS PERMIT WIDER LATITUDE CONCERNING CONCENTRATION OF THE ORGANIC TIN CATALYST, THUS VOIDING THE CRITICAL SENSITIVITY TO CONCENTRATION WHEN USING TRIETHYLENEDIAMINE ALONE AS THE AMINE CATALYST. THE BEND OF FORMATE SALT AND HPI HAS OTHER SIGNIFICANT ADVANTAGES OVER PREVOIUSLY TAUGHT CATALYSTS.
Inventors
- 👤 F Carroll
- 👤 H Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:47
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/20; C08G18/2009; C08G18/2027
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |