US3621093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making reinforced thermoset articles
Assignee: Freeman Chemical Corp
•
Filing: 1969-07-01
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Granted: 1971-11-16
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Expires: 1989-07-01
Abstract
Abstract An improved process for rapidly making reinforced thermoset articles from molding compositions which include unsaturated polyester resins and fillers utilizing molding apparatus having heated mold surfaces. The molding composition includes 0.1 to 0.20 parts by weight of polyacrylates of polyepoxides. The cure time for the resulting article is less than one-half that required for molding compositions containing the identical unsaturated polyester resins without the polyacrylates of polyepoxides.
Inventors
- 👤 Glenn R Svoboda
- 👤 Fred G Singleton
- 👤 Lindley H Eshleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:59
CPC Classifications
C; C08; C08F; C08F283/00; C08F283/01; C08L; C08L67/00; C08L67/06; Y; Y10; Y10S; Y10S525/00; Y10S525/922
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
14 words
The improvement of claim 1 wherein the said polyepoxide is diglycidyl ether of bisphenol-A.
Claim 2
Dependent Claim
12 words
The improvement of claim 1 wherein the said polyepoxide has the formula:
Claim 3
Dependent Claim
12 words
The improvement of claim 1 wherein the said polyepoxide has the formula:
Claim 4
Dependent Claim
16 words
The improvement of claim 1 where the said molding zone is a matched metal die mold.
Claim 5
Dependent Claim
14 words
The improvement of claim 1 where the said molding zone is a pultrusion die.
References Cited (Backward Citations)
US3301743A
Cited
US3256226A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |