US3808162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of urethanes and catalysts therefor
Assignee: 3M Co
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Filing: 1972-10-10
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Granted: 1974-04-30
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Expires: 1992-10-10
Abstract
Abstract THE REACTION OF POLYISOCYANATES WITH POLYHYDROXY ORGANIC COMPOUNDS TO FORM POLYURETHANES IS CATALYZED WITH A CATALYST SYSTEM COMPRISING A SOFT-ACID METAL COMPOUND, E.G., STANNOUS ACTOATE, IN COMBINATION WITH A CARBOXYLIC ACID HAVING A PKA GREATER THAN ABOUT 0.23, E.G., 2-ETHYLHEXANOIC ACID.
Inventors
- 👤 M Allen
- 👤 M Nozari
- 👤 Dyke Tiers G Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:41
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/166; C08G18/168; C08G18/161; C08G18/22
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) | 1977-04-29 | 1977-10-29 | 1978-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-29 | 1981-10-29 | 1982-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-29 | 1985-10-29 | 1986-04-30 | $7700.00 | Window Closed / Lapsed |