Patent US3238154A successfully refreshed from Google Patents.
US3238154A
Expired / Lapsed
US
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Preparation of a polyurethane resin using a tetraalkyl guanidine as a catalyst
Assignee: PPG Industries Inc
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Filing: 1961-08-10
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Granted: 1966-03-01
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Expires: 1981-08-10
Abstract
No abstract record available.
Inventors
- 👤 Paul R Mosso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:56
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/1858
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
39 words
A METHOD OF PREPARING A POLYURETHANE RESIN FOAM WHICH COMPRISES FORMING A LIQUID MIXTURE OF AN ORGANIC POLYISOCYANATE, A POLYOL HAVING A HYDROXYL NUMBER BETWEEN ABOUT 40 AND ABOUT 600, AND AS A CATALYST, THE MATERIAL HAVING 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) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |