US4246210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low temperature maturation of sheet molding compositions
Assignee: Owens Corning Fiberglas Technology Inc
•
Filing: 1978-08-04
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Granted: 1981-01-20
•
Expires: 1998-08-04
Abstract
Abstract Composite sheets of low pressure molding compounds sandwiched between films of polyethylene are thickened to a viscosity at which the film can be stripped from the composite by the application of low temperatures to at least the surface of the sandwiched composite.
Inventors
- 👤 Edward L. Wilson
- 👤 Walter D. Cottrell
- 👤 Robert J. Gelin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:31
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/54; B29C70/542; C; C08; C08J; C08J3/00; C08J5/00; C08J5/24; C08J5/241; C08J5/244; B29K; B29K2067/00; B29K2067/06; B29K2101/00; B29K2101/12; B29K2105/00; B29K2105/0002; C08J2367/00; C08J2367/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
40 words
A method for thickening a sheet molding composition comprising an unsaturated polyester, a monomer and a thermoplastic to a condition wherein it is handledable, said method comprising subjecting said sheet molding composition to a temperature substantially less than ambient temperature.
Claim 2
Independent Claim
40 words
A method for thickening a sheet molding composition comprising an unsaturated polyester, a monomer and a thermoplastic to a condition wherein it is handledable, said method comprising subjecting said sheet molding composition to a temperature substantially less than ambient temperature.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein said temperature is between about -10 and about -80 degrees C.
Claim 4
Dependent Claim
42 words
The method of claim 1 wherein said sheet comprises a first layer of a polyethylene film, a superimposed layer of a thermosetting resin composition, a superimposed layer of a reinforcing material, a second layer of thermosetting resin, and a second polyethylene film.
Claim 5
Dependent Claim
13 words
The method of claim 1 wherein said reinforcing material is chopped glass fibers.
Claim 6
Dependent Claim
18 words
The method of claim 1 wherein said low temperature is reached by the application of solidified carbon dioxide.
Claim 7
Dependent Claim
17 words
The method of claim 1 wherein said sheet molding composition is substantially free of chemical thickening agents.
Claim 8
Dependent Claim
17 words
The method of claim 2 wherein said sheet molding composition is substantially free of chemical thickening agents.
Claim 9
Dependent Claim
17 words
The method of claim 3 wherein said sheet molding composition is substantially free of chemical thickening agents.
Claim 10
Dependent Claim
17 words
The method of claim 4 wherein said sheet molding composition is substantially free of chemical thickening agents.
Claim 11
Dependent Claim
17 words
The method of claim 5 wherein said sheet molding composition is substantially free of chemical thickening agents.
References Cited (Backward Citations)
US2187146A
Cited
US2428977A
Cited
US2804653A
Cited
US3083410A
Cited
US3171870A
Cited
US3153685A
Cited
US3242246A
Cited
US3701748A
Cited
US3499954A
Cited
US3975353A
Cited
US3963844A
Cited
US4079024A
Cited
US3988388A
Cited
US4112036A
Cited
US4042646A
Cited
US4085246A
Cited
US4038342A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-20 | 1984-07-21 | 1985-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-20 | 1988-07-21 | 1989-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-20 | 1992-07-21 | 1993-01-20 | $7700.00 | Window Closed / Lapsed |