Patent US3767602A successfully refreshed from Google Patents.
US3767602A
Expired / Lapsed
US
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Shelf stable polyurethane catalyst mixture and method of preparing cellular polyurethanes using said mixture
Assignee: Air Products and Chemicals Inc
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Filing: 1972-10-30
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Granted: 1973-10-23
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Expires: 1992-10-30
Abstract
Abstract DIBUTYL TIN DIACETATE, WHEN COMBINED IN AN AMOUNT OF FROM 3% TO 50% BY WEIGHT WITH ABOUT 97% TO ABOUT 50% BY WEIGHT OF THE FORMATE OR ACETATE SALT OF AN AMINE POLYURETHANE CATALYST PROVIDES A COMPOSITION HAVING AN UNEXPECTEDLY LONG SHELF-STABILITY. THE TIN CATALYST AND AMINE CATALYST CAN BE PREMIXED IN THE DESIRED PROPORTIONS AND STORED. AT A LATER TIME, THE DESIRED AMOUNT OF THE MIXTURE CAN BE INTRODUCED INTO THE URETHANE PRECURSOR SYSTEM TO VERY EFFECTIVELY TRANSFORM THE PRECURSOR INTO A SATISFACTORY POLYURETHANE CELLULAR PRODUCT.
Inventors
- 👤 F Carroll
- 👤 J Panchak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:46
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/161; C08G18/163; C08G18/165; Y; Y10; Y10S; Y10S521/00; Y10S521/904
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |