US3819672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foaming unsaturated polyester resins
Assignee: Dow Silicones Corp
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Filing: 1971-07-12
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Granted: 1974-06-25
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Expires: 1991-07-12
Abstract
Abstract UNSATURATED POLYESTER RESIN FOAMS ARE PREPARED WITH THE AID OF A PROFOAMER WHICH IS A COPOLYMER CONSISTING ESSENTIALLY OF (A) ISO2 UNITS, (B) (CH3)3SIO1/2 UNITS AND (R-)2-N-R''-SI(-R")N-O((3-N)/2) UNITS WHEREIN N HAS A VALUE FROM 0 TO 2, R" IS AN ALKYL RADICAL CONTAINING FROM 1 TO 18 CARBON ATOMS, R'' IS AN ALKYLENE RADICAL CONTAINING FROM 1 TO 18 CARBON ATOMS AND EACH R IS SELECTED FROM THE GROUP CONSISTING OF THE HYDROGEN ATOM, ALKYL RADICALS CONTAINING FROM 1 TO 18 CARBON ATOMS AND AMINOALKYL RADICALS CONTAINING FROM 2 TO 18 CARBON ATOMS, THE RATIO OF THE (B) UNITS TO THE SUM OF THE (A) AND (C) UNITS IN THE COPOLYMER BEING IN THE RANGE OF 0.4:1 TO 1.2:1.
Inventors
- 👤 W Joslyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:40
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08G; C08G77/00; C08G77/04; C08G77/22; C08G77/26; C08G77/38; C08G77/382; C08G77/388; C08J2367/00; C08J2367/06; C08J2483/00
Claims Analysis
Total Claims: 0
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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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |