US3823099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermosetting unsaturated polyester foam products
Assignee: Individual
•
Filing: 1971-09-24
•
Granted: 1974-07-09
•
Expires: 1991-09-24
Abstract
Abstract THERMOSETTING UNSATURATED POLYESTER FOAMS ARE PREPARED BY INITATING A BLOWING REACTION AND A CURING REACTION IN A THERMOSETTING, UNSATURATED POLYESTER RSIN MIX. THE BLOWING REACTION COMPRISES REACTING IN SITU A SMALL AMOUNT OF A POLYISOCYANATE COMPOUND AND A HYDROGEN DONOR COMPOUND EXOTHERMICALLY REACTIVE THEREWITH SO AS TO FORM A GASEOUS BLOWING AGENT PRIOR TO GELATION OF THE THERMOSETTING RESIN. THE BLOWING REACTION ALSO ACCLERATES THE CURING REACTION SUCH THAT THE POLYESTER RESIN ATTAINS A GEL STATE DURING EXPANSION OF THE ESIN BY THE GASEOUS BLOWING AGENT AND CURES IN AN EXPANDED CONDITION.
Inventors
- 👤 E Doyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:56
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/12; C08J9/14; C08J9/143; C08J2367/00; C08J2367/06
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) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |