Patent US3796674A successfully refreshed from Google Patents.
US3796674A
Expired / Lapsed
US
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Organo-tin aminocarbamate catalyst for preparation of polyurethane foam
Assignee: Wacker Chemical Corp
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Filing: 1973-01-22
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Granted: 1974-03-12
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Expires: 1993-01-22
Abstract
Abstract A PROCESS FOR PRODUCING A POLYURETHANE FOAM BY REACTING A POLYALKYLENE GLYCOL WITH AN ORGANIC DIISOCYANATE IN THE PRESENCE OF A BLOWING AGENT AND A CATALYTIC AMOUNT OF AN ORGANO-SUBSTITUTED TIN AMINOCARBAMATE.
Inventors
- 👤 G Lengnick
- 👤 K Pande
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:15
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/22; C08G18/24; C08G18/242; C07; C07F; C07F7/00; C07F7/22; C07F7/2284; C08K; C08K5/00; C08K5/56; C08K5/57
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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |